A:
He will try to find a way to get back to the original timeline first, and then he will be in touch with another self. There's no one who knows more about the timeline than himself. The same is true of most AU.
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Canon Murder!Sans / Dust!Sans Facts
General FictionAll of this information was taken from the "Ask-DustTale" tumbler page → https://ask-dusttale.tumblr.com (Also the page is open to questions and is still answering. But I think you should read a bit to make sure you're not asking the same question...
