Well, of course you guys didn't know--but unless they're fan-fucking-tastic actors, I think it makes a difference.

People who are actually violent, actually fighting and actually out to hurt other someone else are pretty fucking terrifying, and most people pick up on those cues right away. You can just tell. It'll change your reaction to them, no question. So if there was ACTUALLY something terrible going on, your class could easily have acted a whole lot different.