I helped build and operate a medium sized art car at Burning Man. We had a guy on a bike ride directly into the rear of our extremely well lit, loud, and (relat

I helped build and operate a medium sized art car at Burning Man. We had a guy on a bike ride directly into the rear of our extremely well lit, loud, and (relative to the bike) large art car. We were parked. He got up and rode away with no explanation.