Drink Black Tea Calmly at Hogwarts

A total of seven secret passages leading to Hogsmeade were drawn on the Marauder's Map that Zhang Xu had seized under various excuses.

According to what the Weasley twins said back then, Filch knew four of them, and the twin brothers knew another three, including the one that collapsed a few years ago.

And this time the Death Eaters' sneak attack took the path that was blocked due to the collapse.

In the map in Dumbledore's hand, there are four other secret passages leading to the depths of the jungle, and a secret passage leading directly to the bottom of the lake.

Considering the historical background of the construction period of Hogwarts Castle, it is not surprising that there are so many escape routes.

Dumbledore estimated that the map passed down from generation to generation by the headmaster did not include all the secret passages.

On the map provided by Dumbledore, only one secret passage leading to the Forbidden Forest is usable, and the rest have collapsed.

The secret passage leading to the bottom of the lake was fine inside, but the exit above the bottom of the lake was blocked with stones by unsuspecting fishmen.

Of the four secret passages known to Filch in Hogsmeade, three have collapsed in the past few years, leaving only one usable.

In other words, Zhang Xu needs to set traps in the three tunnels leading to the Forbidden Forest and the four tunnels leading to Hogsmeade.

After Zhang Xu explained the design ideas and principles of his trap to Dumbledore, Dumbledore immediately approved his plan.

It's just that Zhang Xu has limited materials on hand and can only set up a trap for one secret passage today, so Dumbledore asked him to first set a trap in the secret passage that the Death Eaters used last night to prevent the Death Eaters from using it again. A secret passage.

After coming out of the principal's office, it was already dinner time, and Zhang Xu, who was already hungry, walked to the cafeteria.

Today is the last day of the Christmas vacation. All students at Hogwarts have returned to school. Everyone is discussing the harvest of the vacation in the cafeteria while waiting for dinner to start.

However, the news that Hogwarts was attacked last night quickly spread from Peeves to the students.

This incident quickly caused an uproar among the students. Coupled with the news about the Azkaban prison break in the Daily Prophet today, various rumors began to spread among the students.

Zhang Xu found Fred and George who were chatting with their classmates at the Lion Dean's table. He gave them a piece of parchment and said, "Tonight at ten minutes to eight o'clock, take a Go find Filch in his office."

Then he ignored the confused twin brothers and walked straight back to the long table in Yingyuan to eat.

Fred and George arrived at Filch's office on time. After reading Zhang Xu's note, Filch handed them a huge toolbox.

After getting a box of tools and materials for repairing wall holes from Filch, the twins followed Filch's instructions and went to the mirror on the fifth floor.

At this time, Zhang Xu and Peeves were already waiting here.

Zhang Xu waved to the twin brothers to follow him, and then led them and Peeves into the secret passage behind the mirror on the fifth floor.

The reason why we brought Fred and George to help today is partly because they are familiar with all the secret passages, and partly to give them a heads up, lest the Death Eaters kill these two instead of tricking them to death. A person who likes to explore secret tunnels has been tricked to death.

It is not an exaggeration to describe the secret passages of Hogwarts with nine turns and eighteen turns.

After walking a long way in the secret passage and going down several stairs, Zhang Xu and Peeves finally arrived at the collapsed place.

Along the way, Zhang Xu told the twin brothers everything that happened last night, except that he concealed the fact that the Death Eaters were led by Snape.

Fred and George were both shocked when they learned that the Death Eaters had infiltrated Hogwarts with the help of rat biscuits they invented.

"Just shorten the effective time of the deformed biscuits you sell in the future to less than one minute." Zhang Xu said to the two of them.

At this time, they had reached the obstacle. Zhang Xu pointed at the half-collapsed hole and said, "If their deformation time is less than one minute, they might get stuck in the hole."

The secret passages in Hogwarts are all made of stone and are relatively strong, but they have not been maintained for hundreds of years, so collapse in some places is inevitable.

At the collapse site in front of us, the stone slab at the top of the secret passage was pressed down by a huge rock and soil.

A huge rock is located just above the secret passage without being discovered, which is very dangerous during tunnel construction. Because the boulders in the soil are invisible, when the soil beneath the boulders is hollowed out, the boulders can easily collapse the tunnel under the action of gravity. Cases like this could fill a history of tunnel construction with blood and tears.

Now it seems that magic was used during the construction of the secret passage, which caused the huge stone to collapse the secret passage hundreds of years later.

Zhang Xu observed the entrance of the hole where the Death Eaters had come for a while and found that this side of the boulder was slanted and covered with soil. The back half of the hole was made of stone and the front half was made of soil.

This section of the soil had collapsed a lot after the Death Eaters got through.

Zhang Xu poked the surrounding soil a few times with his wand, making it appear that the soil had naturally collapsed and blocked the hole.

After all, Shen Feng Wuying can only drill holes, but cannot strengthen the cave walls.

Zhang Xu looked around again and found that the collapsed boulders and soil had tightly blocked the secret passage.

After checking the scene, Zhang Xu began to arrange tasks.

"Peeves, look for all the vents from here to the next corner."

"Fred, George, after Peeves finds the vents, seal them all up, preferably so that no trace can be seen in the secret passage."

The twin brothers had no objection and followed Zhang Xu's instructions and started to block the vents with Peeves.

The vents in the secret passage are very hidden, but with the presence of Peeves, who is the earth descendant, the vents can be discovered quickly through the ventilation ducts in the mud.

After Zhang Xu walked to the first corner and chose a place, he drilled a wrist-thick hole in the stone slab at the top of the secret passage, then conjured a herringbone ladder, climbed up and stuffed a piece of C4 into the hole. , and then inserted the detonator and fuse.

After guessing where the new collapse in the secret passage would not be affected, Zhang Xu took out a gas tank from his treasure bag and placed it there.

Later, all the vents will be blocked, and then this secret passage will be blown down. This section of the secret passage will form a confined space. The tank of gas that was just replaced on New Year's Day is enough to turn this place into a gas chamber.

The unpleasant smell accumulated in the secret passage for hundreds of years should allow the Death Eaters to ignore the unpleasant smell of ethyl mercaptan in the gas.

It's just that in the future, when I'm too lazy to go to the kitchen, I won't be able to secretly cook and eat in the dormitory.

According to the work regulations of house elves, it is okay for them to deliver food to the professor's office and professor's dormitory, but not to the public dormitory.

One trap is that the simpler, the better. Simplicity sometimes means fewer flaws, and fewer flaws means it is difficult to detect.

It would be better if the Death Eaters had a smoke to cool off.

After the twins and Peeves blocked all the vents, Zhang Xu lit the long fuse, and then led everyone to run away.

After a loud "boom", the shock wave rushed through the secret passage. Fortunately, Zhang Xu added shields to everyone, so except for being shaken by the huge sound, everyone was fine.

After the dust settled, Zhang Xu and the others returned to the explosion site and found that the secret passage had collapsed and was blocked by mud and rocks.

After checking that there were no gaps that would cause air leakage, Zhang Xu asked Peeves to pass through the obstacle and unscrew the valve of the gas tank on the opposite side.

After Peeves returned, Zhang Xu left the secret passage with them.

Zhang Xu estimated that he would have to purchase many bottles of carbon monoxide from the Muggle world to have enough. After all, the bottles could not be taken out this way, and the odorless carbon monoxide was more concealed than gas with ethyl mercaptan added.

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