Nice gill. Its always cool to see an aggressive fish like that. Half the best fishing stories don’t even involve big fish, but instead some of the crazy things that happen.
If they can’t fit it in their mouth, my guess is they are reacting and/or trying to kill the wounded prey. Once killed, they can pick it apart. I used to see that happen with raising fish. And I think we see more often fish chasing a large bait, hoping the bait will tire out so they can attack it.