Duncan disaster

[Kellyscoral]

My duncan went literally from about 15 polyps 3 or 4 days ago to Skelton showing today. All other corals are fine and parameters are as they always are - my thought is that it likely got stung by its neighbor. My question is - since there is a tiny little bit of green flesh still showing on one head, is there any chance it might survive - anything I can do for it?? Thanks!