I sometimes wonder if the door was CGI'd into the original video. :/
I doubt he'd have the budget for it regardless of how popular his channel is. Because if it is CGI, it's damn good.
The reality is, that's what happens when you play with explosives. It forces it's way out through the path of least resistance. Which is the windows and doors. They're only held in by glue and rubber or in the case of the door by a couple of hinges and a lock. You can see after the door whips past him his brain processing the "holy
**** that was close" moment. American's love their guns and explosives, but there's no way in hell I'd be doing that sort of thing that close.
This is what 50lbs of tannerite (same stuff FPS Russia uses) will do to a car. And these guys at least have the sense to be a safe distance away.
And when he fires the shot, look at what comes hurtling in their direction. Passenger side door.