That kid's seen too many movies about breaking glass with bare hands or arms without getting a scratch. That's Hollywood glass. The real thing almost always inflicts cuts and I personally know of one person who died after walking through a sliding glass door due to rapid blood loss.
Note that his accomplice is wearing a backpack. On unfamiliar young males wandering about in residential neighborhoods, it's the official uniform of a guy who's looking for something to steal. It never fails.
instant karma, too funny. Fools caught on great video in broad daylight. If homeowner kept the glass they could even DNA match off it once they find the guy.