[It's much easier to answer Rossiu since he's being so calm about everything and not full of indignant rage or panic over being taken from home, he will give him that.]

I'm afraid I can't answer that...nobody really knows how you get here. But I can tell you that you won't be able to go back home, at least not right now. There...isn't really a way home that we know of.

But while you are here, time back home will stop. If you do return, you will be back where you were before you arrived.

[It's a lot to take in, he understands. But it's better that he knows as much as possible now instead of just...well, not knowing.]