Maz will take a quick took around from the stairwell, looking to see if he spots anyone or anything unusual. After taking his time (trying not to look to suspicious), he heads back up to his room and proceeds to cast his spell. It had been a long time since he had used this spell, but it was undoubtedly useful for what it does. Assuming the enemy was weak minded, of course.
He proceeds to maintain concentration on the spell, and overlooks all of the customers in the area, as if he was trying to spot someone or something particular.
Afterwards, he joins the owner (wherever he may be) and strikes up a small chat, before asking
"Anything unusual?" He makes sure to mention his scar on his left check and the name Maz (although not claiming it to be his own), to make sure the owner knows who it is.
Spoiler
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Spot: [roll0] Looking for an out-of-place customer.
Cast detect thoughts. (only if it's not obvious he's using it after casting it. If it is he won't cast it, due to customers being able to tell he cast it).
Conceal spellcasting skilltrick (incase someone is observing him and he is unaware of it) [roll1]