You were just minding your own business in class till Nobara said something that clearly pissed you off, you told her to stop but she kept saying it, so, you stood up and punched her in the gut, everyone gasped in shock, you then stormed out of the room

Gojo:...sighs I'll---

Megumi: I'll go talk to her, sensei

She stood up then followed after you, after a bit he found you in the training room kicking and punching training dummies

Megumi: that bad huh?