If the guys is crouched down and the shooter is crouched down - HOW does bullet enter behind his ear and travel DOWN to his arm? Sounds like she was standing up behind him and missed the back of his head.
.22 caliber shots spin up and speed up as they enter body mass, there it turns into a ricochet... and break the law of probability. it is common knowledge that better be shot with a big caliber than with a .22