Organize some kind of resistance. I can't help but think that this persons ability to injure so many with a knife is the result in some way of the sheep mentality we instill in kids today.
"Don't fight back, violence solves nothing, let the authorities handle it."
Dog Pile that POS. He might be able to cut or stab a few but he can't hold back a wave of people from stomping his head in.
Also I bet he's is or was on some kind of anti-depressant.