His mouth does looked banged up like he hit something. It was obvious with my fairy Wrasse, banged up snout and doing the corkscrew dance, sure sign of a spinal injury. I was able to catch him and move him into an acclimation box so he wouldn't get tossed around by the current.
Was hoping he'd recover but after a week in the acclimation box, he showed no sign of improving. The saddest thing was watching him perk up when I fed the fish and would try and swim. I tried spot feeding him but he had no stamina at all to go after the food. Instead of watching him slowly starve to death I euthanized him using clove oil.