As far as I'm concerned, once they started walking in, you could have zoomed in just a tad and just let it run. They were going in, the grass wasn't in there way at all really. I love watching the natural progression of them moving into a box but I get that you have to monitor them and you don't have the time I do. Someone must have ran out of energy flying and crash landed. It's so odd how fast your bees move onto those frames. Maybe it's because you're leaving more honey on them than most others do.