Keltham doesn't answer; he's running through basic possibilities for abolishing the slave trade in Golarion, just in case he's missing something obvious. Some of the thoughts are along the lines of 'maybe don't sell any +4 intelligence headbands to Absalom' and 'if this is what Cheliax was like before the Church took over, they might have done some pretty extreme things in the takeover process that they'd want to conceal from me until I understood why that was necessary', both of which are explanations for why the Conspiracy would want to fake this.
If he decides this world is real, among Keltham's next steps is going to be talking to that paladin to find out what Good's current plans are on this slavery thing.
...if Ordinary were deliberately protecting him from this, though, they should've warned him about it. Not just walked him into an abused-people-market.
He's going to focus on this test. Needs to focus on this test. It also matters, even on this scale.
And something about him is taking all of this more seriously, now, even to the point of being willing to inconvenience bystanders. But he's not - quite - seeing what he should - the Conspiracy has obvious responses - no, he's not thinking clearly, even if they have obvious responses, he should run the test anyways - the trouble is not thinking about things -
Keltham is looking for somebody in his field of vision who looks like they might be the local equivalent of a Security wizard, or police officer, or the non-Nidal version of a person carrying an expensive sword.
He's not able to stop himself from thinking that the point is to find somebody who'd be difficult to mind-control, or who it'd be a very big deal to mind-control.