Very neat video!
I’m with Hickok, I was cringing when he put his hand near the cylinder. My experience with cylinder blast was shooting a .22 S&W Model 17 in a training class, and I was attempting the crappy shooting hold with my left hand gripping the front of trigger guard. All that I got was a quick sting and a lot of burnt powder on my fingers, and I learned not to do that again.
Thank goodness it was only a .22!