Except that wouldn't do much. Sure, he can warn them that the ritual will fail eventually because someone who may have been a future time traveler did something, but we didn't give a time and date here. It goes on the Prophecy Shelf with all the other 'A great warrior/mage/whatever will step forth to oppose our reign of unspeakable evil' divinations.I don't think they can do 'whatever'.
But if this guy is local to the time we're in, and not a newcomer to the 'past' through time-travel, we'd be leaving him in a perfect space to naturally change the timeline in ways we'd hate.
Because we are the cause of the changes then, having pushed him into acting against us, or some shit.
What my paranoia is trying to say here, I guess -
No matter if we finish the ritual, the very fact we had a fight is a timeline-change if he's local.
He gets to fuck with time if not killed, likely fucking our timeline over as a result, even if he doesn't know who we are.
If he's not local to the time, he still gets to change things - like we would if we stay here for a bit after the ritual's complete (looking for Heart Trees' the excuse. But we could do more if we were amd enough to).
Sure he won't change thigns about Drowny now. But other things?
Y'all wanna bet that he won't find a way to fuck things up, being behind us for thousands of years?
Hell, all he needs is to leave a message for local-time Squids to have them act against the faith of Drowny for these millennia.
Our current ancestors are Red Dragons so he can't kill them, and our human ancestors won't be vulnerable until deep in the era of low magic, where a single time travelling Aboleth would have conquered the world with contemptuous ease so we can assume they can't go there.
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