WTH anemone fine then almost dead or is it about to split?????

[fishoholic]

My GBTA did that when I first got it and maybe once in a blue moon it would look a little bit more shriveled (like after I fed it a silverside) but it was over a few hours. I've never seen my RBTA shrivel up, and I've never seen an anemone go from being fine to literally almost totally shriveled up in a matter of minutes.

My RBTA is normally the size of a grapefruit, when I noticed it didn't look right it was about the size of an orange and as I watched it, it shrunk rapidly to the size of a walnut, which is where it's at right now. It was shocking to watch it shrink right before my eyes.