@lucig4 – you may not think so, but your post is contradicting itself.

If the Doctor’s death is a fixed point, then he was regenerating in The Impossible Astronaut. We see the regeneration light show.

However, he can’t regenerate any more (The Time of The Doctor). That’s the contradiction.

The simple solution is that he always was inside the…[Read more]

@lucig4 – he’s inside the Tessalector. The ‘regeneration’ is a light show created by the Tessalector so that it looks as if the real Doctor is really regenerating.

There’s a forum for The Impossible Astronaut – though we don’t really discuss the regeneration effect, because we were doing a retrospective rather than watching it for the first time.