Long story, but it was the side effect of time travel. Which we did not all that long ago. Granted, what I'd seen before was the side effect of a lot of time hacking going on, but that doesn't mean somethin' can't happen cuz we did it once. And there-- uh, well, there were scientists there that could stabilize the loop issue, but holes in time still opened up and took people with 'em.

[Which is obviously what's worrying him the most.]