I'll be nice and back off the stupid comment, but you're incredibley naive if you think he wasn't under the influence... Why else do you take off? Give me one realistic reason to do so... As morally unfortunate as it is, you get in a lot less trouble for a hit and run than a DUI related accident. A completely innocent accident will at most cost you money...and probably only raised insurance rates because the potential law suit would go to your insurance company.
If you believe otherwise, I have some choice beachfront property I'd like to sell you for pennies on the dollar!