[Pretty much all of the Master's expressions look crazy, he's used to it. He just shrugs at his declaration.]

If that's your choice, then so be it.

[He starts to walk away, then halts, turning back around like he's just remembered something.]

Gallifrey's still out there, you know. Frozen in a moment in time, hidden somewhere, waiting to be found. I saved it. All of my selves saved it.

[Because the Master's the only other person who can appreciate what this really means to him. Sure, he's crazy, and he'll probably spit on his accomplishment, but he has to tell him.]