You walked into the teacher's lounge. Aizawa noticed you, and was about to speak up, but upon noticing how pissed you looked, he went silent, knowing not to mess with you when you're this upset. Unfortunately for the others, they were unaware of this, and Vlad walked up to you, probably to mess with you. Aizawa watched, both slightly scared of you, and amused because he wants to see how badly Vlad will be injured after this. He's always hated the man for his arrogance and selfishness.