Kyle's reaction to him was one that drew amusement, mentally without any outward sign. After all, to say he was amused would give the game away a bit and he wasn't ready for that. Not yet. For Sinister, the point of pretending was his own private amusement. A few touches here and there to make the subject jump and reconsider, but never quite enough to give them a reason for true fear. In Kyle's particular case, he didn't have to try all that hard. Kyle was already keyed up and distrustful.
Why was it that animals were almost always smarter about evil than humans?
"I hope I'm not interrupting," he kept a bit of his amusement in his voice, letting it appear to be because of Kyle's tone and behavior. "You are here because your group leader requested you be evaluated against a possible contagen." That was basically the reasoning behind the physicals. Making sure there was nothing that had been missed which could result in death. Storm was perhaps being overly cautious, but an unexpected death could cause that in a leader.
"I do have to let you know, there will be blood work done. I can never remember," he pulled out his best old country doctor impression. "Are you afraid of needles?"