It'll take a little longer for things to fade away enough that at least we're not in the palace anymore—save for one ornate mirror; just in that midpoint between dimensions.

One mirror. One very-decorated mirror [it is from the palace]. Standing there. The only clear object to be seen.

If a mirrored surface is the way in, then it is also the way out?

Should it be so, Keldor will take it so he can go and rest and not think or feel or whatever for a while until he's properly recovered or, merciful Zoar, he's dragged back in, but the narrative wouldn't do that, would it?.