"TARDISes can't leave ruts." She points out, helpfully. "And it's very hard t'be in one, when everything keeps changing."

She pauses to consider this.

"Though, it's easier, here, oddly. You can blame the Landlord for just about anything, but no one knows precisely what he does. Or if he exists, really. You'd think in a place as odd as this one, ruts wouldn't be so easy."