Not our owls, but a relative in this news story from last month. A couple of peregrine falcons who thought the GHO was intruding forced it down. Apparently swimming to shore can be the easiest way to get out of the water, and those wings make pretty good paddles – a great breast stroke!
And by the way, Mom left the nest about 15 minutes ago for what might have been a meal provided by Dad. She wasn’t trying to be quiet as she dropped out of the nest, so I’m pretty sure she was not hunting prey on her own. She was back on the nest in 5 minutes of so.