"I would be careful, this place is of dwarven quality, and you don't want to trigger its defences. But before we go, I just need a minute to get a sample of this stone. Though I would recomend you let me finish my examination of the wall."
With that, Hathor pulls out a hammer and chisel, and takes(or tries to take) a small chunk out of the wall. After that he does a more detailed examination of the wall(now that the rubble has been moved).