It's something I'll end up explaining sooner or later. In Haven - that's where I'm from - we have what we call the Troubles. They're supernatural afflictions created by people from another world, using aether from the void in between the worlds. The aether is absorbed into a person, and manifests as... well, kind of like what you might call a superpower. Only they can't really be controlled, and they're usually very dangerous.
There was a man who had a time-travel Trouble. That was, he made other people travel in time when he got emotionally distressed. The first time I met him, he was surprised to see me because he'd met me before, way in the past - and that was when he sent me back. It got a bit circular and confusing after that, but I think everything worked out the way it was supposed to.
I have no idea how the time travel works here, unfortunately. It's definitely a question that's been bugging me. Handy thing about the Troubles; no matter how weird they got, we could always trace it back to a person - or multiple people - and figure things out from there. This is... something else.