Several reports say that after the bus was cleared, a group of guys did got back onto the bus to try to save the kid. The psycho came after them with a knife in one hand and the severed head in the other.
And, in a tight space with a knife, I think I could fend off 3 or 4 guys. I could do some serious damage with the knife, at the very least (unless one of the guys happens to be a well-trained marine or ninja or something). A regular Joe Schmuck would be gutted, however.
See, that's the thing, though. I'm not mad that the kid was unable to be saved (well, I am extremely mad, but...), I'm more mad that the entire bus was cleared before anyone had the reaction "Hey this kid is being stabbed let's get this guy!". I commend the group of guys that got back on the bus, even if they were chased off!
Too little too late, but at least they tried. And in a tight space with as knife, I seriously doubt anyone could fend off a bus full of people. That sort of thing isn't an anime or a video game where you just press a button or something! If a bus full of people, or even 4 or 5 people were coming at you, you'd be too shocked or even just clumsy to even really react! I mean, if I end up hearing this guy was a Marine or something, that's one thing, but being a big guy alone doesn't mean shit! How many of you guys have ever actually been in a fight, or at least more than one or two fights?