or … as he had been brainwashed into becoming a tranny, targeted kids as they still had their whole (pure) lives in front of them, started shooting, hit some - then had second thoughts/doubts, emptied the mags and then topped himself. As you say (and I am glad he did) only kill 2 does seem a bit odd.
Kind of like the people that shoot themselves with shotguns, but at the last fraction of a second change their minds but end up taking their faces off.