First, let me say that a beer drinking "competition" is one of the stupidest things I've ever heard of. Beyond that, I'd guess he had some underlying health problem that exacerbated things, but I've gone into a-fib by drinking 6 beers in 1.5 hours. Of course, I have underlying health issues, too. I hope that some good can come of this by people realizing what a stupid f##king thing it was to do in the first place.