What is the little multi-colored icon above the mercenaries head in Diablo 2? I have noticed it appear during the middle of combat and it makes a weird noise when it happens to. What exactly is happening with my mercenary at that time?
Edit: Here is the screenshot, you can see one monster is dead and the other is right next to me. So it isn't anything to do with being cursed or anything I don't think. It appeared a good 5 times pretty quickly. When I said multi-colored in the first post, it looks like this is blue/green/white and it swirls around in a circle. I guess it isn't very little, my mistake.

