First of all it happend like that. I got to the tallest building, later I made a new mission then this happend... CJ that was the player objective keep punching and it keep hurting also. So later I made another character as the player and bad luck happend. I made him with a weapon then he shot me and I died. I got to the hospital I thought like "hmm.. That was weird, maybe that was just a small bug. I got again to it and when I touched the player objective he keep shooting again and I died. So I didn't know what to do so I thought to post it. That is a bug.
Did it happen with you before?