I almost drew when a young man with no shirt and bloody nose bust into my small office building. He was panicking and looked high. I started to pull and tell him to get on the floor. He pled with me to let him use the phone and I did. He called 911 to tell them he had head butted his girlfriend. He practically had to beg them to send an ambulance which I thought was odd. I did keep a grip on the 9mm in my pocket the whole time.
It's called a HEADbutt. Lead with your forehead, not your face.