Bristle worm VS Sea hare

[bullit67]

Well this might seam strange but I put a couple of sea hares in my tank to help in my battle with green hair algea I was looking for them today and when I found one of them it looks like it was being attacked by a bristle worm almost looked like it was burowing into the sea hare I moved a couple of rocks and the bristle worm retreated into the rock so I pulled the rock out hoping to remove the worm. I havent seen the hare move since I tryed to pull it from the rock but it still seams to be holding on tight it has its head in a hole in the rock I was also wondering if the bristle worm entered from the head maybe through the mouth and burrowed right through the hare. Is it even possible that a bristle worm would kill or attack a sea hare?

Any thoughts ?

Doug