In response to Golguldir's suggestion, Aldbane smashes his hammer and puts a crack in a flagstone. The vision in the glass does not change.
Serech muses over this puzzle. "I would agree this seems to be a reflection of a different time. I wonder if it could show a certain point in time on command? Or even another location?"
Grampus walks up to the mirror and touchs the surface and pushes gently sayin "let me pass please". Grampus disappears into the mirror
Golguldir says "Mirror, mirror, on the wall; who is the fairest of them all?" No answer is forthcoming
Rhod decides not to bother trying to lift a flagstone, as Aldbane's demonstration has achieved what Golguldir decided to check.
Catweazle, somewhat oblivious to his companions' actions, peers closely at a particular detail in the chamber and tries to relate it to the same spot reflected in the alleged mirror, to see if there is any observable difference between the two - in colour, dust, lichen, wear, or the like. Muttering and blowing through his whiskers all the while. Does this fog the surface of the mirror, coincidentally?
Everything seems identical, and the mirror does not fog.
About a minute later, in the mirror you see the reflection of Serech entering the room and looking in the mirror, closely followed by Golguldir (this is activity that happened at the top of page 5 of this thread)