The fight seemed to be turning very quickly against the goblins' favor. Three of their numbers were down, another one has fled, and they've barely managed to injure the adventurers in return. It was very clear they weren't going to win this fight, and turning around and running away was the more prudent course of action. If only they could make sure they wouldn't be cut down when they tried to flee...
OOC:
Still waiting for the PCs actions for this round. So far, only Will has acted, slicing another goblin down with his sword.
The attack vs Nightshade was premature, because he acts first in the round. @nepets - you have a chance to kill the goblin attacking you before he has the chance to hurt you.