[ even without his knowledge of time travel and whether or not it's even possible (though, on account of the things he's come to see are possible here, he's come to trust that the doctor nor clara would be lying about the whole thing), he can grasp the idea of its complication, of how even a time traveler might be skeptical about a proclamation that the regrets of some several dozen people could be changed in an instant. ]
And how you even determine what a fixed point is? Shouldn't everything theoretically be a fixed point?
Ah. Yes. That's where it gets a little sticky, you see. There are rules, a whole lot of rules, and some of them don't always apply. [He waves a hand like he could grasp a thought out of the air, making the whole concept make sense. But — ] Sometimes you just throw out the whole rulebook. But the common thread in every fixed point is the severity with which it affects the rest of the timeline, you see, and not just your timeline — though that can happen — but the entire universe's timeline. Sometimes the universe itself is at stake. That's when you know — that's when there's a big circle with a cross over it, a 'Do Not Enter' sort of bit.
[ So, in a nutshell — it's all really timey-wimey. The Doctor has experience in feeling most of these fixed points out. And the reason he knows his own regret is a fixed point is because ... well. Undoing it on his own, undoing it like he still sometimes dreams he could do, would render the rest of the universe too fragile.
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And how you even determine what a fixed point is? Shouldn't everything theoretically be a fixed point?
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[ So, in a nutshell — it's all really timey-wimey. The Doctor has experience in feeling most of these fixed points out. And the reason he knows his own regret is a fixed point is because ... well. Undoing it on his own, undoing it like he still sometimes dreams he could do, would render the rest of the universe too fragile.
He'd endanger everything, and everyone. ]