After surveying the Orrery briefly, the guard turns to face Skaith with a look in his eyes that hovers somewhere between "stupid tourists" and "whoa there!"
"I'm sorry... sir, but there doesn't seem to be anything wrong here. Furthermore, I assure you that we are capable of spotting anything capable of damaging the Orrery, given the wards and the fact that the thing is practically indestructible. I haven't seen any city-stompers around, not lately anyways, so I'm pretty sure there's nothing wrong up there. Please continue about your business, sir, and leave the guarding to the guards."
By now he's worked himself into a state of mild annoyance, and is looking at Skaith intently, unsure as to his motivations or intent.