That sucks! It is true, hit-and-runs happen more often than we releaize. I've been riding/commuting/touring 22 years. Been hit twice. Forutunately not seriously hurt either time. Both times, during the day. Neither time did the driver stop. Now I ride with my blinking tail light on and head light on (day and night). I think lights help even during the day. Rude drivers suck! I hope your friend heals quickly. I also hope your friend doesn't loose the passion for cycling.