No shit, dude, just AIR...apparently. I'm guessing the dude's finger must have slipped and pressed the trigger a bit TOO hard. Think the inner tube of a bike tire, inflated by a blast of compressed air. Yeowch.
And that guy seemed a bit too friendly with this kid...blowing air at his face and neck, then blowing air into his ass, and apparently he knew the EXACT location of the kid's asshole.
The butthole is in the same spot for all human beings. You must be an alien.