Two people backing up into each other
My Neighbor and I were backing up at the same time and I guess we both checked and thought it was safe to go, so we backed up. Our cars hit, leaving a long scuff mark on my car, and a crack in his rear bumper cover. I tried to offer my insurance information and apologized, but he went off and peeled off down the street. We were on our way out anyway, so when we started driving down the road we saw him coming back. He was coming at us like he was playing chicken, forcing me to steer quickly into a nearby cul de sac to avoid colliding with him. Two days later he sends his son to ask what I'm going to do about his car, and then comes over irate saying I was the one at fault, and nothing like him trying to run me off the road ever happened.
I would just like to know if it is a 50/50 thing at this point, and what I should do. I could go over to his house (he's a bit nuts though) and exchange insurance information with him, even though I doubt that he has insurance on the vehicle after his reaction. Is there any other action I can take, or should I just wait it out?