Depending on the angle death or go under the skin and ride the skull until it exits. You will also have to explain the GSR and stipling on the attackers head.
I'm probably a bad example to use for this little experiment, as I've been hit once or twice before so I know what to expect.
To me, it was a quick little off balance feeling, and bit of a ring in my head if that makes sense. The eyes did want to close, had to fight them back, and it is definitely difficult to impossible to keep your head from popping back.
Remember guys, 1” 1 knuckle. It’s training not a fight. The point of the exercise is to demonstrate the effects of impact to certain places, like the Barrow Receptor, with light pressure. The effects with an impact tool, even one without “teeth”, would be definitely fight changing. That is if you’re skilled enough to capitalize on the opportunity.