I'm reminded of one heron that used to regularly fly into the back yard (garden) and hunt for fish in the lake. One morning I watched as the bird move very very slowly towards the submerged fish.
Some fifteen minutes into this process a dark shadow crossed the lake and down swopped an eagle, just inches above the water, grabbed the fish and soared up into the sky and off into the distance. You just have to imagine the look of surprise on the heron's face - if it had been human you'd say it was saying "What the b***** hell....!" as it watched its meal disappearing into the sky.