In case anyone else is wondering, on the upper right of the same page you can see that one of the desk's legs snapped diagonally, that's what the sharp thing is.
I'm guessing it somehow ended up in front of her face when she went tumbling down.
The best girl is clearly the loli, she just wants to have fun and already has kinda a crush on Toto.
Honestly, dancer girl gives me the heebie-jeebies, and how is a relationship with her supposed to work? Do you succumb to her? Then you're just another pet. Do you resist? Then that means no...
Yeah, if he's using Rei as his name in contacts instead of Clover, then he's probably also just a pawn.
Clover probably convinced him something like "This guy took your place in society from you. Back when you were being bullied you were pitied, you could blame them for how shitty your life...