By the time Rin had the man down on the ground Marcus had a gun drawn and pointed at him, not having hesitated.  He probably would've shot him point blank at first sign if Rin hadn't been between them.  This would be easier.  Crouching down he pressed the muzzle of the gun to the captive's temple, wordlessly readying to pull the trigger when there was shouting from the group.  

Tess was running their way.  She had seen the end of the fight, racing forward to help at first.  but now the man was defenseless and on the ground, and it looked like Marcus intended to kill him anyways.  "Wait!  Marcus let him go!"  She said, skidding to a stop when she reached them.  "He can't hurt us now," The pilot stopped speaking abruptly though when Marcus's attention snapped to her face. His expression was cold, his glare almost seeming to cut right through Tess.

"He's UKD."  Snapped Marcus, clearly not willing to budge on this.  "He's dead."