About 20 years ago I saw a police training video where an officer was detailing a struggle he had with an armed perp. They struggled and the officer ended up lying on his back with the perp sitting on the officer's chest, pointing a .38 at the officer's head. The perp fired, the officer thought he felt only muzzle bast. Officer starts swearing at perp, perp freezes, giving the officer the opportunity to knock the perp off of him and knock gun away. Officer then realizes blood is coming from his forehead. The perp had shot the officer in the middle of the forehead and freaked when the officer reacted by swearing, instead of dying. I think the .38 was loaded with LRN bullets.
In the original post, I suppose the victim could have been knocked out by the impact which is why he thought the GF ahd hit him