[He observes the change in Ion's expression carefully. It seems he could be caught unawares by this. Could he not know...?

But he absorbs all of Ion's information carefully. The volatile manner in which Arietta had reacted to Jade's very presence had made him question whether or not she had some kind of truce with the others there from their world, but according to Ion that seems to be so.

And another juicy peace of information: she does know about the original Ion. But of course she probably cannot process it properly. He was left to wonder what Ion she was shouting about when he blindsided her with that question earlier.]

I see. This is all useful information. However, there's one detail I've been wanting to focus on.

Ion. Do you have any idea what time she "arrived" here from?