What a weird mishap. How sad for them To know in September that their season is over (unless there's a miraculous recovery) must be as depressing as the injury itself.
A bright side is that if you're going to tear your Achilles, tearing it a few months after the Olympics is better than tearing it a few months before. I'm guessing he'll be able to make a full recovery and be back next season, but still.. Very sad.