Glancing around, Ruth doesn't see anyone that might be Blag. There's little activity this far down on the Shelf, and the distinctive features of a goblin--curly ram-like horns, massive, beady eyes, warty green skin, and the like--would be easily noticeable on any passerby. You hope that he might already be at the Lift; you're able to make out a few figures by the small "gatehouse" sitting next to the lift, though that's no guarantee that one of them is the goblin. There's always a few guards stationed there.
It's certainly not the tall person in front of you. His skin is dark and smooth, not at all like goblin skin.