The Master

He was already on his feet, but rather than bolting immediately for the TARDIS, the Master had turned away and was staring out over the fields. Carefully he stepped to the perimeter of the TARDIS' defense shields, where the air had just begun to thin out, and closed his eyes, listening to the pulse in his head. The thing he'd never be rid of no matter how hard he tried-- the reminder of his own betrayal and manipulation. For a moment he had an insane urge to run across those fields, as fast and far as he could, even if it would eventually kill him.