The comment about lighting up your team is spot on also.
Last night game I was at there was one guy who was like a five year old with a new toy. He could not keep his hands of the light, he flashed people in the face, lit them up so the enemy team could spot them and generally made an ass of himself.
He flat out didn't get it; not sure if he was team killed or not.
Airsoft, where nothing is hurt but feelings.