How awful! But, it is not your fault. I can probably say with all truthfulness that dad was probably pissed that their trip would be ruined. Remember the dislocated thumb story I told you last night? Well, the next day, Scott and I were flying to Phx and Tucson to check out schools and visit. I was furious, even though it was irrational. The docs didn't want him to fly the next day and they only said OK because our friends we were staying with are doctors. And that wasn't counting the stress from a crying 17 year old who was told he couldn't take his bike with him because of the injury.
It sounds like this kid needs a serious talk from your DH and you about being a bit cautious? I know racers need to take risks, but maybe he needs *really* slow speed drills? I'm not a coach, but this sounds like a personality issue, rather than a skills issue. He needs to learn how to channel that talent. I would wait a day or a few hours today and call the dad and talk to him.
And you are just feeling the guilt one feels when you are responsible for a kid. See what you've missed?