Yet is that scene really like that? Is not Number 6 the one who is unemotional, cold and calculating as he reveals Number 1 to be himself! He then proceeds to chase Number 1, who he finally seals in the nose cone, before setting the countdown for the launch of the rocket. As for the destruction of his alter ego – Number 1, well yes I have to go along with that. But Number 6 might not be quite the man he was without his alter ego. Perhaps he'll find himself quieter and more sedate in the future, unable to make the difficult decisions he once did, the hard and difficult decisions which his alter ego made for him on more than one occasion.
Judging by the evidence of the scene itself, I would say it is not Number 6 who goes berserk, but Number 1! Number 1 who has been confronted by his alter ego, who cannot face the truth of the matter. That he has been the Prisoner-Number 6 all along.
Faced with this truth, Number 1 starts running about the Control Room, laughing maniacally, as he desperately trying to evade his other self, which he finally does, by climbing the steel ladder up into the nose cone of the rocket. Giving one final defiant maniacal laugh as he drops the hatch on his adversary.
Number 1, was he mad? Well that question was asked of Number 6 once, in ‘Hammer Into Anvil.’ The psychiatrist said not according to their records. In my own opinion, and that is a layman’s opinion, Number 1 was as mad as a hatter. But who wouldn’t be, cooped up in that rocket all the time. The only way he could enjoy The Village was though the experiences of Number 6. And many of those were far from pleasant!