Call me crazy, but I think Iddee was knocking all the bees off the cluster with the sound waves from the bucket banging like a cruise-ship blasts Somalies off the deck of a modern pirate ship. Never seen them fall from a cluster like that before. His method was effective, it was the results that I scratch my head on when I saw then reform into 3 distinct clusters.
I can see where THIS method can come in handy to DISLODGE a queen causing her to retake flight an land in a better opportune place for the beekeeper to catch the swarm, but once landed in a better place, I'd be putting the bucket down.
Cool display of sound in motion.
My mentor SHOWED me sound one time by parking his truck toward an open field with a dense tree line about 800ft away. He said "Want to see my horn?" I didn't quite understand the question, but said "Sure." and thought we were going to get out of the truck...
It was night and lightly raining, he put on his high beams and HELD his horn down for about 3 seconds - the sound went across the field, bounced off the trees and came back a few seconds later and the light rain vibrated before my eyes for the full three seconds - amazing!
And if you don't think Iddee's bucket was loud, if he had aimed it at you, you would have felt it as well as heard it. Iddee, very interesting display indeed.