This chapter was the equivalent of a TV cop two days from retirement. You could feel something bad coming but didn't want to believe it.
I agree with whoever said Aizawa's strict behavior with students will stem from what goes down with Shirakumo. We know he's super positive but the U.A. rumor from the main series says he quit trying to be a hero and caused all sorts of trouble. Quitting U.A. is bad but causing trouble could mean just about anything.
Also, Aizawa and Shirakumo are pretty much a team so it's a safe bet both guys were there but one protected the other. Then there's Purple Highness. Even if he doesn't die, his injuries could force him to retire. Plus, there's the villain itself. Was it a random person or someone that could pop-up later? So many variables, I love it.