Theres a reason why it spit it out only to take it back down head first. So any kind of fish cannot extract its dorsal fin. You ever fish? Try making an ok sign around the back of a fishes tail, and slide it towards the head. Guarantee you get stopped at the dorsal. Try doing it at the head and slide it back towards the tail. You'll automatically push its dorsal fins down. A largemouth bass, catfish, even a peacock bass prefer to take their prey down head first. Most of us know just by raising small cichla to large, that we've seen that happen. Bass will in gulf a feeder at times by the tail first. Shake violently in circles trying to rotate the feeder so the tail is hanging out of their mouths. That loach was a twinky compared to what that mono can take down.