Frank's expression probably gives away the concerted effort he's making to keep his hands to himself. The other man is acting up enough that intimidation would likely make it worse, rather than getting him in line. That's not something he's used to.

"You taught at Quantico."

Right. He shakes his head, trying to piece together how they're going to do this — all without Will's input, of course. Typical of him.

"It's better if we pretend to be brothers. I don't feel like dealing with the alternative. We've got enough shit going on."

The tension — frustration, as much as he hates to admit it — is accumulating. There's no choice that doesn't bring down questions on the both of them, and he can't trust Will not to fuck it up.

"I'll take care of you if you cooperate, but you need to listen to me."