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Thanks gentlemen (and Ron ).
Like all animals that swallow prey whole, the heron had to align the fish properly. In this case, head first, to get it down without tearing apart the bird's throat. Even then, it must have been a little painful because of the stretching and those semi-rigid, pointy fins.
Honestly, the fish was so big that I couldn't even imagine it fitting into the heron's stomach.
I was in Everglades NP and was walking to the end of a boardwalk and saw this scene across some water. Pure luck on the timing of my arrival and the location of the bird.