never seen it personally, but i have seen a thread on a killer coral banded shrimp. Everyone was disagreeing, except until it snagged a couple of fish within a week, and the thread had pics too!. I think that, if hungry, and the opportunity arrives. be it that the fish is sick, sleeping, wrong place at the wrong time.....itll get nabbed. Just the kind of risk you take with owning an aggressive (or at least sometimes) shrimp.
I have a red sri lankan pistol shrimp. Its a very large, more aggressive, pistol shrimp. I have seen my pistol shrimp kill other shrimp such as the peppermints. and seen what i believe was a wound on the side of a tang of mine from the shrimp
His name is "Big Nasty" haha
could be from a rock scrape, but i still think it was Big Nasty