It looks like it's a goner but leave it alone do not touch it it's still attached. I pry them off my rocks all the time and cut them in half with a razor blade and put them back in my tank. If they are healthy propagated specimen they are almost bullet proof.
I wouldn't worry about pulling off the glass besides transferring it on a rock that's the easiest way. The key is how it's done catch edge with butter knife or something like and apply pressure until it releases. Do not tear the foot. I have torn the foot clean off a couple and they survived but they were healthy and not transferred to another tank.
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