And suddenly, Khan stills. Completely. He watches the doctor's approach, something inscrutable in his eyes, gaze flickering between Julian's hands and his face. "I want nothing to do with Starfleet."

An odd statement, considering the insignia on his own uniform, but Khan is no more a part of Starfleet than he is humanity. He's a relic, a wolf in a time of sheep - sheep like this earnest young doctor.

A doctor too trusting by half.

When Khan lunges this time, it's not merely to throw Julian away from him. No, he puts his own weight behind the movement, a sudden explosion of controlled violence directed squarely at the medical officer.