As brought by many posters with knowledge in this field, each manoeuvre is pre-planned and rehearsed. Spur of the moment manoeuvres are unlikely to be executed.
Since the pilot was doing the displays regularly , he would be well aware of all these aspects.
There can be an error due to faulty instruments, mechanical failure or pure simple error of judgement induced by some confusion. One member posted about pilot loosing consciousness due to extreme nature of manoeuvres.
Many of these aspects are likely to become clear after they recover the black box and analyse it.