Ditto, scavengers such as ants, flies etc will move in on a dying animal before its dead, I think bristleworms are no different.I am of the view that bristle worms are primarily scavengers and will not attack living things - others may disagree.
Yea, I went down tot he 240 one night as the lights were coming on to see the little bastard on top of the clam ripping it to shreds. It was a stupid shrimp too, stayed there till I got a net and snagged him out.