What on earth happened to it?

[BlueAbyss]

Hey, whoa, don't be too worried about a worm or something, I just mentioned it because I've come across an account of something like that happening. There's a good chance it was something else, I just thought it might be of some insight. I know most bristleworms wouldn't do something like this unless there was dead tissue on the 'nem, and even then I would think it would stop when it came to healthy tissue... but I could be wrong.

Just noticed your post about it being a bad type of 'nem, wouldn't that just be insult to injury