You were his classmate. And knew about his PTSD involving his deployment. And your in class and see him hyperventilating, so the teacher decides for you- someone who sucks at this kinda stuff, to help him with this. So you walk out with him into the (almost) empty hallway, and sit against the stalls as he hyperventilates.

"O-Oh my god I'm sorry for having t-to have you h-help me with this..i know you s-suck at t-this!!" he says, tears falling down his eyes as he shakes and hyperventilates