Well, legally, I cannot see the other students having any problems. Morally, the decision is not really up to me.
However, I find there are three general types of people when this kind of stuff happens:
1) Cut tail and run away types
2) Fence sitters who may act if galvanized by a strong personality
3) People who act and lead
It is an interesting conundrum, we as a society love violent movies and love the entertainment these situations bring on the big screen; however, run away when an actual situation occurs. Fight or flight anybody?
People's actions will depend of the makeup of the group and the type of situation IMHO. For example, a shoplifter lost the plot in my town a few years back and shot a little kiddo. The people in the store swarmed the attacker in a rage and beat him within inches of his life.
The "shock" factor may apply as well. I do not consider my self a coward, and have several years of military experience to include several "tactical" types schools
. However, none of this truly prepared me for my experiences overseas. I remember I was doing some admin work when I experienced a feeling not unlike being in an earth quake, our doors and windows rattled themselves to near destruction, I was in fact shocked into inaction for several seconds. In fact, I did not initially realize what had just occurred until our country manager, an old grizzled South African commando took command by stating "IED (We later fund out a guy packed his taxi with explosives and took the last train west.), people up top to find out where it went off, people on communication, and people prepare the ambulance units for primary response." I was on the primary response EMS team and was fully prepared to respond into the "hot zone" of this explosion if need be. I was not terrified per-se, I was just initially "stunned" and not sure how to act. I did not even realize what had occurred initially.
It is hard to say what exactly I would have done in this incident. Several people swarming the guy while smashing their chairs over his body could have worked in a pinch. However, I was not there and simply cannot say.
It is too bad these people did not rush this guy as a group and stop the incident.