That's pretty much how th-this Mirror thing works, yes.

[His tone is completely un-condescending. He gets that this stuff is legitimately complicated sometimes, and he's glad that Stan is following along.]

Oh, me, goodness no. It doesn't happen all that often. U-Usually only when a Mirror dies and our Queen deigns to bring them back. Or when a new version of the Real shows up. Then--well, the Mirror is replaced.