[clarke knows it sounds impossible but technically that goes with everything else about being here. she doesn't miss how he seems to avoid her question but she doesn't press the subject if only because she isn't sure if she wants to know yet because if her regret is undone then it won't really matter] It means exactly what I said. People can be brought here from different points in time and even worlds that different from ours.

If you're saying you just saw me back in Polis, it's from a future I haven't experienced yet.