The Magical Principles of Natural Philosophy at Hogwarts

The black dog lowered his body, his eyes were fierce, and he looked ready to pounce.

"Don't want to talk?" Erwin raised his right hand, and then found that the other person's eyes were focused on the wand in his hand.

"I can take the lead in showing my sincerity."

He directly let go of his hand and let the wand fall to the ground. At the same time, he slowly approached the other party, "As you can see, I don't have any ill intentions..."

The black dog's expression seemed to be relaxed, but in an instant his body tensed up, and he turned around and fled towards the wilderness without hesitation. He was astonishingly fast and disappeared from Erwin's sight in the blink of an eye.

Erwin sighed regretfully. The other party was still too alert. If it hesitated for one more second, Erwin could rush over and grab the skin of the back of its neck, and then take it directly back to the Noven sub-space.

Now of course he can chase after him, but there is still the same problem. A wizard who is constantly apparating is obviously more conspicuous than a black dog.

However, Mephisto's brand is still working, and Erwin can sense the opponent's position as long as he is not too far away.

"Who could this be? An Animagus who sneaked into Hogwarts through a secret passage..."

"Could it be the fugitive that the Ministry of Magic has been looking for?" Riddle reminded.

"Sirius Black?" Erwin frowned, "Doesn't that mean I just missed five thousand galleons?"

Two months later, Black's bounty increased, from the initial three thousand Galleons to five thousand Galleons.

"It's not a miss," Riddle chuckled. "Although it's not difficult to remove Mephisto's brand, it's not something he can directly solve alone. He can't run away."

"Then don't rush to chase him away for the time being. Let the dog wander outside by himself. He probably won't dare to come to Hogsmeade." Erwin shrugged.

It shouldn't be difficult for Erwin to deal with this dog now, but trouble is trouble and he must avoid attracting attention as much as possible, so he can't do it in a place like Hogsmeade where a large number of wizards gather.

So far, he only felt that he was lucky and could pick up five thousand Galleons just by returning to Hogwarts.

After walking to the Shrieking Shack again and confirming that there were no other creatures around, Erwin opened the trap door and entered the secret passage.

"Can Animagus only choose mammals as objects of transformation?" Erwin asked Riddle while walking in the secret passage.

Riddle: "..."

"Oh!" Erwin pretended to be surprised, "I almost forgot that you don't know the concept of mammals. It doesn't matter. I can tell you about biological classification first..."

Classmate Tom Marvolo Riddle grew up in an orphanage. Naturally, there was no concept of compulsory education in the British Kingdom at the beginning of the 11th century. He most likely did not study seriously for a few days before the age of 11. After that, He was directly recruited into Hogwarts again, which can be said to have slipped through the nine-year compulsory education in a practical sense.

After listening to Erwin's science introduction in silence, Riddle snorted coldly, "It makes some sense, but it's just some useful knowledge for Muggles who don't know magic." Erwin didn't argue. Continuing with the previous topic, "Mammals at least have a brain structure that is relatively similar to humans. It is barely reasonable to use this to explain the deformation of the Animagus."

....

"No such thing. Wizards can choose birds and insects as their second form, but it will be more difficult."

"Insect form is also possible?" Erwin was a little surprised. "Can it be transformed into a smaller animal? For example, a tardigrade? Or simply a single-celled organism?"

There was no response, so Erwin had to learn more about the biological concepts just mentioned.

……

"If you don't know, you can just say it. There's no shame in it." Erwin sighed.

Riddle: ...

"I also did research on Animagus two years ago, but I didn't think about it in detail," Erwin said thoughtfully, "So in fact, Animagus can choose any creature as the object of transformation. , but wizards have no concept of microscopic organisms at all, so it is impossible for them to become invisible creatures?"

"Maybe." Riddle said indifferently.

"It's a pity that we cannot verify this conjecture under our conditions." Erwin felt a little regretful.

Riddle is an incorporeal soul fragment, and of course it is impossible to transform himself, and Erwin has long lost the possibility of becoming an Animagus. After entering Novin's subspace for the first time and accepting transformation, his The second form has been fixed as the original dragon.

The exit of the secret passage was at the root of the Whomping Willow. Erwin used the four stealth spells, optical invisibility and sound and smell isolation, without triggering the plant's early warning mechanism, and walked out of its attack range unharmed.

The whomping willow is not difficult to handle, but it is a protective plant and is valuable. If it is injured, you will have to pay compensation.

Looking at the castle under the moonlight, Erwin suddenly felt like he was home.

Without breaking the four stealth spells, he walked slowly into Gryffindor Tower. It was the end of the Halloween dinner, but the students actually gathered in front of the common room, looking panicked.

Something happened, Erwin frowned slightly.

Classmate Potter was also in the crowd, and he looked very bad.

The portrait that served as the entrance to the Gryffindor common room was now in tatters, the torn canvas scattered on the floor, and the Fat Lady was nowhere to be found.

"Judging from the incision, the thing that tore up the canvas was not a very sharp claw." Riddle said.

"It matches the characteristics of a canine, and it should be the black dog that did it. Now I am [-]/[-] sure that it is Sirius Black." Erwin nodded slightly.

"Sneaking into Hogwarts to do evil is considered a good dog of mine." Riddle's mood was filled with a bit of pride.

"If Sirius Black's purpose was to seek revenge against Harry Potter for 'you', then why did he choose to try to enter the Gryffindor common room during the Halloween dinner? Harry was obviously eating in the Great Hall at this time ." Erwin questioned.

"Of course we should go to the lounge first, and then wait until midnight when everyone is asleep before taking action."

"Since the mission is an assassination, why destroy the portrait? That will only expose his existence and arouse the alarm at Hogwarts. It will be almost impossible for him to have another assassination opportunity in the future. This does not make sense. "Erwin shook his head.

Riddle was silent for a moment. He couldn't say that the Dark Lord's men were all losers and couldn't even do such a simple assassination job.

"Professor Dumbledore is here!" someone shouted.

The students automatically moved out of the way. Principal Dumbledore's attitude was calm and his face was as normal, which made the originally panicked students feel at ease.

.

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