I'm sorry to hear about your friend. Unfortunately that kind of thing happens to even to the best seasoned riders out there. There was probably nothing he could have done to avoid it.
I've heard so many stories like this from others. I've talked to riders with many years under their belt. It seems everyone I know with a bike has a close-call story to tell, and it kind of freaked me out when I heard all that. I love the way bikes look and sound, and I'm not scared of riding one, it's just that I have little protection from what others may do. I changed my mind about riding one.