most take off rolls have a point where if it goes wrong the result is not going to be good. Almost anywhere between "rotate" and actually clearing the airfield fence is likely to be tricky. At least there was no reliance on the engine to keep supplying the motive force in this case. Gravity is pretty reliable, never been known to fail without warning, always gives 100%.
My only concern with this is the distance to the nearest civilisation, if he cocks up the landing and has to walk back..........
R6A