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Jim explains quietly, everyone hearing, that the corridor is 80' long ending in a T-junction and has 8 pairs of opposed high quality mirrors. He doesn't bother mentioning the burnt out stub of torch towards the far end. He's eyeballed the first five pairs of mirrors and is heading back to check out the remaining 3 pairs.

Meanwhile Alecia and Nix work their way through examining the set of 3 central pillars with Sue looking on but still listening up the corridor.

As Jim advances along the 50' of corridor that he's already covered, Woody advances 30' along the corridor to keep out of the torchlight (and keep his Darkvision functioning.)

Jim advances 10' and looks at the mirrors (and endless reflections) to the north and then south.) Nothing untoward happens so far as Woody can see.

As soon as the column search is done and Alecia ready to go with him, nix will oblige with the magic vision where indicated

"Team, I'm planning on casting mage hand spell to touch the mirrors starting with the first one." "Any thoughts", ask Woody to the group. "I suggest we stand 20 feet away when I do this. I will also wait for Jim to come back before doing this."

[as soon as nix has a chance to see if they are magical, he'd agree about the mage-hand (and stand back) ]

Jim will stop short of the mirrors with the burnt out torch between them. He tries to see what he can of the rest of the tunnel further on but does not approach the torch on the ground nor the mirrors to either side of it. He will turn back to the others and relay what he sees as well as the burnt torch on the floor between the 2 mirrors. "Perhaps I am being overly cautious, but the burnt torch lying there seems odd" he mentions.
Assuming he is informed of what Evenwood and Nix plan on doing he backs out of the way with a passing comment "perhaps you could use that hand to carry a lit torch down the hall, at least up to where the burnt one is. Maybe it will trigger something?"

"You know, what the hell am I doing?" Alecia asks with a bored expression. "There is nothing here. What's going on? Mirrors?" She asks distracted.

It takes Alecia something less than 20 seconds to finish the third central pillar and the pair to the NW. It would take something less than half that to examine the last pair to the SW.

Jim returns and quietly discusses mirrors and spells with Woody. Nix holds up a hand to indicate 'nearly done'.

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Is Alecia happy to spend another two rounds to complete the pillar inspection (9 of 11 done, takes another 12 seconds total.)?

Yes she does, she is just frustrated.

No more writing, just a loose stone near the bottom of the southern most pillar.

Kneeling down by the final pillar Alecia regards the loose stone with interest (assuming the same perception roll is revelant) she checks to see if there are signs of a trap, or if the stone appears to have been replaced.

Alecia does not see a trap. It's very possible the stone has been replaced.

Drawing the dagger that lay in a tatty sheaf on her left hip she shifts the stone experimentally, in any other place she would wonder what on earth she was doing, this wasnt a normal place.. If coins were laying on the floor, and there was a room with mirrors, perhaps someone had hidden something behind this stone.

Sue observes watching the parts of the group run like a machine. Ready to spring on any threats that may appear.

Once Jim is back and Nix is done with the scan Evenwood cast mage hand and uses the hand to touch and to try to move/lift the first mirror on the left. If nothing happens he will try the first one on the right and so on until the mage reaches 30 feet / maximum distance.