"What? You think a bounty would appease me? Please, I kill fuckers like you, I don't bargain with them," The Doctor had wronged him and in John's eyes, he deserved to die. Grabbing the Doctor around his neck, he hauled him close protectively as Jack arrived, partially using him as a shield to protect himself but also tilting him so the gun was firmly against his temple.

"Oh give me a reason not to, Jack. Really, give me one good reason. Because no matter what happens after this point, I'm screwed. The benefit I have is that I can at least screw you two over in the process," Yes, the old John Hart end game. If he had to suffer, he could make sure everyone else did. He could take the Doctor's life and hurt Jack quite badly before he ended up locked away for the rest of eternity. "Trouble with taking a man's freedom, Jack. I have nothing to gamble over. This is literally it, I'm not going to lose or win either way regardless of what happens to him. I just feel a little happier when he dies!"