Powerback
Think the powerback has nothing to do with takeoff performance, it looks like he just can't make the 180 turn at the end. The runway itself is only 20m (major airports usually have 45m), don't know the width of the turning pad, nor the turn radius of a B727 (guess it will be more then a B737; main gear being more aft due to tail mounted engines)..
Besides: how far do you dare to back without somebody on the interphone?