To shoot with a Gas Mask on is not impossible, but it is something you must train for, initially, it is hard to even aquire a target because you have to lean your head so far to the right with the mask on. Not to mention coming in from the cold, to a heated building, would absolutely fog your mask. Then, breathing in a mask is almost like breathing through a straw when running.

There is nothing easy about shooting in MOPP gear. Nothing at all. I don't see a 20 year old with no military training being able to pull it off...sorry. I just don't. Not with such accuracy. I guess, and this may sound bad, but it is relevant. I would want to know how many shots per it took to fatally hit each person. That could explain a lot. But then if you take into account smoke filled halls? It is amazing the kid knew where he was heading at all. It would have been near impossible to see. between a foggy mask and smoke filled hallways.

I don't know, but, whomever killed these children, Government or this 20 year old kid, they/he need to be dealt with in a more "Medieval" way.