Originally Posted by retmil46

Even more basic than that.

What two senses did the young gent need to know he was even remotely aiming at one of his intended targets?

SIGHT and SOUND.

Turning off the hall lights, throwing a couple of smoke canisters in his vicinity, and continuously sounding the school's fire alarm or class bell, could have ended or severely curtailed his rampage depending on the circumstances - he might even have panicked and left the building altogether, if sufficently dazed disoriented and confused.