Uhm because shirtless werewolves did nothing for Drac but make him chuckle and think about the time he shaved a certain word into Wayne's back fur?

Drac looked positively offended. "Aggression? In my class?"

Jackson would not still be walking of his own free will, if there was.

"No. Mr Jackson is merely exhibiting normal teen werewolf gruff and attitude." He gave the man a look-over. "You're too young to be his father; are you his brother? Perhaps you should speak to him about this."

Cause Derek was TOTALLY out of his attitude phase, obvs.