Bubble tip Brittle starfish

Okay, remember, "no question is a stupid question"....

Two days ago I was moving rock around in my 11 gallon reef tank and my
bubble tip brittle starfish got a leg caught and it came off. There
is about an inch left on the leg at the body. The broken off part of
the leg is still moving around the tank and scavenging for food. It
gathers up pieces of mysis shrimp and curls it up to the top (right
where it is broken off). Is this normal? Can a whole body rejuvenate
from this broken section? There was no part of the body that broke
off with it, it was too far down the leg. If it was just nerves, how
long does it take to die?
It is just freaking me out! Looks just wrong.

If I am at the wrong part of the forums, please direct me to the
correct area.
Thanks.
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