The wormy things are leeches, many of which have pseudo-annulations so they can look like polychaetes. That inch-worm posture is very characteristic. The other thing is a juvenile stage of a gnathid isopod. The head is down below on the left & the siphon-looking structure is the tail. They're blood suckers like leeches. More info on them here http://dailyparasite...rimaculata.html
Thanks for the id! I assume the leeches are opportunistic and taking advantage of physical trauma caused by a larger organism and are not entirely responsible for the mess going on up there, is that reasonable? Otherwise... I may stop diving .