Was the night crawler actually stuck? I've seen this happen to my eels with red wigglers where they get attacked so quickly that the eel accidentally sucks them through their gill, but they got it out themselves and then went right back and ate it.
Did your fiancé actually have to reach in and pull the night crawler out?
He was trying to see if it was stuck. Him swimming away from his hand is what made it come out on its own.