Horseshoe crab missing tail...

This morning I woke up and saw my HS crab on his back still kickin'. I turned him over and he started going around the tank (not w/ his usual spunk), then went to the corner and just sat (didn't bury himself as usual). then I noticed his tail was missing? I saw the angel pickin him up, actually pickin him up off the sand a few inches w/ his mouth, but I don't think he has the jaws to break off the HS's tail. Only one fish could be the culprit....DogFace!
Which is weird cause he pays no attention to anything except my fingers and his silversides. Maybe I'll find out more when i find the rest of the tail?

 

I noticed alot more damage and here's some pics.



Look at the edges of the crab do you think tha angel's capable of this? I don't know if I should take the crab out or let the angel and/or puffer eat him. Is that cruel?

 

good possibility queen angels like to eat things like that, small crustaceans, mollusk,
and corals

 

Ahhh let them have a slap up meal , he is part of the food chain, chances are he may die anyway, not to be cruel but this is a natural thing in the wild, but whatever is eating him they must have a good set of gnashers on em, or you could put him in a refugium if you have one.

 

I'd definitely blame the puffer. Angel fish is probably just taking advantage of the situation and trying to snatch a free meal.