That hits him like a physical blow, like a slap to the face. Because that's the problem, isn't it? That's right at the heart of it. He's afraid of fucking that up.

"I just..." His jaw works for a moment. "I don't want to fuck everything up. And I do that. I fuck things up." He shakes his head, trying to clear. "You can yell at me all you like -- I deserve it -- but will you at least take your leg off?"

He still wants to look at whatever is making Jack limp like that, but he'll take whatever he can get.