body: Today, I tapped another car on the highway. The driver got out, and I immediately asked if he was okay. He said he had a bloody lip but that he was otherwise okay. we checked the cars for property damage but found none. He also checked his work laptop and it worked still. He then looked at me, nodded, and said "Drive Safe." We both got back in our cars and I anticipated exchanging information, but he drove off. The police were, of course, never called. To the best of my knowledge, he has no information about me.
  
  
  Obviously this is a fantastic break for most people and a relief. However, I am wondering if there is any possible liability on my end. He was the one who left the accident scene unprompted, and I sat there bewildered. Perhaps he lacked auto insurance or had some ulterior motive for leaving. He seemed rushed. Regardless, should I report this as a cover-your-ass? And what are my risks for doing so or not doing so? 
  
  
  This took place in Illinois. 
  
  
  Thank you.
  
  
  
title: Very Minor Car Collision with No Damage, Hit Car Left