Now Arthur's annoyed, but justifiably so. He can see Kathryn's eyes darting to the door, and he takes a deep breath to try and calm himself because he doesn't really want her to leave. Even if she does turn out to be Eames he has so many questions.

"You can't come up with one thing that only you and I - Eames and I would have talked about?"

He realizes that Eames could have given her something to say, but something about her body language and impatience now makes him feel like she's telling the truth.