it is also good to foster decent attitudes. Rather than have someone go:
"I swing my sword, cutting the monster's head clean off its shoulders."
you should have them go something like this:
"I wing my sword, aiming to cut the monster's head clean off its shoulders."

This is doubly true when it comes to player-vs-player interaction. Where it is reasonable to do it in player-vs-non-player, it is mandatory in player-vs-player.