"It's not a lie, I'm not lying." That was what Sam had been pushing for and Jack... Jack wouldn't do anything that bad, would he? He wanted to neutralise Barty, he had to assume that meant nuking his powers. There was no way to use Barty, he was impossible to control. Wasn't it better to fix than keep. Either way, he looked at Barty, clearly uneasy.

"You said you would go back to your cell. You promised." Just a little hope he had that maybe this would all end nice and easy. Yes, it was unfortunate and Barty had looked through the files but no one had been hurt. As far as this could have gone, not the worst? Even if Jack might yell at him.