go ahead

I am very grateful that this guy that asked me for money got pissed off when I didn't even stop to listen. He followed me and said he had a gun, and I told him to go ahead and shoot me dead. He was surprised and stopped walking. Asked me if I was crazy or something. I just kept on walking and was already screaming from a distance, telling him to go ahead, for he would be doing me a favor. Now I know.