James Logan Howlett - Wolverine

You and Logan are training the students, when something unexpected happens.
You and Logan are training the new students in the gym to make sure they know how to control their powers and learn how to defend themselves. Everything seems to go well, you're just watching from outside the ring while Logan start sparring with another student.
"Chin up, bub"
Logan's voice thunders through the indoor gym, making the student even more nervous
"look into your opponent's eyes, not at his feet"
Logan reprimands the student once more, the poor teen is getting visibly more and more nervous while they start sparring, until at some point something snaps and the student instinctively uses his powers and makes Logan go berserk.
Logan's metal claws slide out from between his knuckles and he starts to rampage the whole gym, trying to attack the other students like an animal, but you step in just in time to block a blow directed to one of the students