Amazingly enough, it looks like the bubble coral caught and ate the shrimp! It made me think two things:
1: how stupid and slow do you have to be to be caught and eaten by a bubble coral???? Hence, perhaps it was putting the poor stupid thing out of its misery!!!
2: I wonder what happened to those two other shrimp that just disappeared without a trace?
Whatever the case, it was pretty funny (in an expensive and somehow unfortunate way) to have this sight greet me when I got home from work....