Crab eating crab

I got my first shipment of Scarlet hermits and emerald crabs. I know they
will occasionally molt and have been told they will look like a dead crab,
so I have been keeping an eye out for this. I found one of my hermits on a
rock without a shell.... the back end looked long and translucent-like. I
wasn't sure if it came out to die or if this was the infamous molt. Next
thing I know an emerald was snacking on it... looked like it was eating
flesh. My guess is it was dead and being eaten. Now I am concerned about
all my others... they are all of a sudden difficult to find. I find legs or
pinchers here and there and say a little prayer for my little buddies. What
do you guys think is happening? Does anyone have a pick of a molt and
hermit out of its shell?