He hesitates when he picks up his mobile, daring to give the other Time Lord a ping-- he doesn't want to, but he does at the same time, so he sends along the message, with coordinates. //I need you//
The Master doesn't pause in his work for another hour or two despite hearing the noise from that infernal mobile the Doctor insisted he have. Finally, he tosses aside the wrench in his hand and looks at the message, lifting an eyebrow at it and sending back, "on my way."
He appears twenty minutes later, smirking, "you called?"










