He's antsy.

Mia wonders why that's the case. Diego is a very composed man... or he was. "You're right," she says, a little dry, "All I need is an open store and someone willing to make a sale."

But she pushes her drying hair back off her face, something she doesn't need to do as there is no hair on her face. It's a compliment, and fairly straight forward in a round about sense. "See you later, Diego."