Hermit eating dead Turbo Snail at night, caught on camera

There was one turbo snail that looked dead.

It had been upside down for two days, I turned him right side up on a rock covered with brown algae, it didn't move for a few hours, I took it out of the water to smell it, but it didn't seem dead, so I put it back on the rock.

Didn't move for hours, and now as I arrive home from a wedding party I found one of my large Hermit Crabs eating it. Caught him on camera.... ugly shot because it was a night shot with a video camera, but you can see what was going on....

Here is another view of it: