"Yes," Miles answered, "though my guess would be those people were never true participants. Actors would make more sense in that case, and since the job was so short-term there's almost no chance they'd compromise anything." The more Miles thought about it, the surer he felt. All of it was conjecture, but it was a good theory if he did say so himself. It was a theory that would perhaps never be proven or disproven, but it amused him to wonder about it anyway. If he wasn't challenged he got bored.
Avery's reply about his disinterest in psychology made Miles think it important to ask as many people as possible about their motives for joining the experiment. Whether they were truthful or not didn't matter to him, because the answers people were willing to give were far more telling about who they were - just as Avery's was, along with the hint of agitation in his posture. Miles listened with rapt attention, again studying the restless firelight reflecting against the other man's skin.
"Opportunity." Miles nodded, as if agreeing. "Me too. I came across an advertisement when my living arrangements became less than desirable. I was preparing to leave my flat when I got the call I'd be a replacement. Perfect timing." Miles fell silent after that, debating what to say next. He couldn't help the curiosity that had nudged at him when Avery had mentioned not wanting to return home, but ultimately decided the subject was too heavy to breach - at least from his end of things.