"Yeah, yeah. I've probably done more emergency first aid than you have, you know."

He grumbles, upset that he has to do it himself instead of being fussed over (being fussed over would also be slightly upsetting. Popp is a sensitive young man even when he's not thinking about his beloved teacher's funeral). He can and will do it, wincing now and then because cleaning out a cut always stings more than getting it in the first place.