That was definitely not what he meant in regards to his previous question. He manages to get a quick glance at the door before the light goes out, before managing, "...I've seen something like that before."

He walks over to where the door was, peering at the wall in the darkness. "Before I came here. We were travelling and had to cut through the Mines of Moria." There's something telling in the way he says the name -he's not exactly the kind of person who is easily shaken, but Balrogs will do that to a person. And the apparent loss of a friend. He moves on, "The doorway was some sort of elven magic. It could only be seen when the moon was out in full."