Impressive takeoff. Looks like the pilot held it level just above the runway to build up the speed necessary to make that steep turning climb. I've heard of GA pilots in twins doing this sort of thing, taking off but holding it in ground effect while the gear retracts and then rocketing up to the departure altitude when they near the threshold.
Kinda like doing a soft-field takeoff in a Chickenhawk 172, hold in ground effect to build up speed. But that's a sedate ride compared to doing it with some serious jet thrust!
So did he switch off the flight control computers and fly it under "natural laws"?