The Master cocks his head with a tight smile. He's having a difficult time reading her; there's a whiff of Time Lord about her, but not nearly as strong as a full-blooded one. That alone is frustrating, even without the lingering question of what she's doing with the TARDIS. "Is that so."

He steps closer, the guards tensing appropriately as their lord and Master puts himself in the line of danger. "And what time stream did you come from?"