Brain coral sting clownfish?

[Hoopz87]

Alright so I came home today and found one of my snowflake clowns missing. After searching around the floor, I knew he didn't jump. Then I saw the hermit crabs and snails eating the remains of the clown (very little by the time I got home but I could tell it was him). Now my question is how could this have happened, I only have a potters angel, and a dottyback in the tank. I also have an emerald crab, a few hermits , snails, and a fire red shrimp. So a few days ago I noticed him hosting my Aussie brain coral, and didn't think much of it besides the brain coral at times getting a littttttttle bit smaller (still huge). But my question is, can the brain coral sting the clown to immobilize him? I can't think of any other reason as to how or why the clown could have been eaten Thanks for any help guys. And my levels are pretty perfect , nitrates a little bit high but nothing that's causing and sps or corals to be effected, let alone fish.

 

[Reef Frog]

I can't see that happening unless the clown was perched there half dead already. Was this a lobed brain? See what others say. Sorry about the loss.

 

[Tweaked]

Clowns are tanks and all I've ever seen is pieces of the coral floating around the tank if they decided to bite it. I would say it was ill or another animal got to it, but not coral IMO.