I’m glad you asked this question, Parcel. It’s one of the most fundamentally important questions to a hypothetical advice giving thread that will ever be asked—each hypothetical thread needs to be asked this, so I’m satisfied that is has finally come about.
What you’re talking about has a lot to do with Antoine-Francois Momoro, a French Printer. "You accuse me, who have given everything for the Revolution!"
Well, we all know those famous words. Now, had a time ripple set Antoine in the midst of the Battle of Attu, the situation you are describing would have most certainly happened. Despite Antoine’s confusion, hysteria, and wonderment in the amazing technology that had formed hundreds of years after his time, he would have unknowingly altered the course of time in which the Pacific War was lost, in turn making a future outcome of World War II to be won by the Axis powers. The world wouldn’t end due to the very precise timing of the time ripple and whom it affected; ripping some French dude into one of the most vital and horrific events of all time.
So the answer is simply: unexplained and unexpected time travel in way of time ripples that interfere with World War II at the precise moment, enough not to upset the delicate threads of time but completely destroy the future in the process.
