Back in the days, if I had put too much food on my plate, my mother used to ask: "Where your eyes bigger than your stomack?" Thats what I wanted to ask this Grey herron, although, better should have been: "Where your eyes bigger than your beak?"
It took at least 20 minutes and he or she must have been a little bit ashamed of itself, since it hided behind the reed once I was discovered. And how he or she did it, I don't know, but after 20 minutes or so of standing, head up, dead down, suddenly the fish slit inside. Like it had to wait for complete dilatation or so ;-p