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Probably several factors used to show it off in a dramatic way:
Very light
Fire by wire protections turned off
High speed at rotation meant plenty of kinetic energy (speed) to trade off as potential energy (height) - notice how it levelled off pretty soon after take off when the speed would have fallen off towards the stall speed.
Test pilots!
peter_h
Stonehedge
https://www.youtube.com/watch?v=UAwlWfXUrb0