We’ve talked about it before, but its a good video!
When I first started shooting I thought the grip where your weak hand loops around the front of the trigger guard was a good grip. Heck there are a ton of guns where they knurl the front of the trigger guard, and/or add a finger rest for JUST this kind of shooting. Turns out I shoot better with my support hand wrapped over my strong hand with my knuckles pointed down range.
Still while qualifying to shoot at my gun club I took this grip…first with a S&W22A target pistol…then with a S&W M17 revolver. Thankfully the M17 is just a .22, and all I got was a nasty scorch mark on my finger, and a little pain. .38 Special, and certainly .357 Magnum or higher would have done some serious damage! Bigger Revolvers can cause Amputation! (GRAPHIC WARNING!)
Its one of those things that veteran shooters don’t really worry about, but when teaching new shooters you always need to keep an eye out. BTW another thing to look out for is crossing thumbs behind the slide of a semi-auto. That can get bloody even in small guns!