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The Master's mind raced, the drums becoming painful to the point as a scream of pure agony passed his lips. So much to the point he hadn't noticed any sort of sound from the door opening and closing. However, his form stiffened upon hearing a voice, a voice he didn't recognize but still had a strange familiarity to it. Forcing his gaze upward and to look at the room around him. The drums in this regeneration had not only gotten worse, but they caused other aspects of insanity to form in the Master’s mind. With a twitch in his body, a sharp gasp of a breath his eyes lifted to the only other being in the room.

The Master had wanted no one to enter this room, to leave him to his own insanity-but instead he was looking upon his guest, seeing his eyes and hair upon his head. This new face of a man was certainly the Doctor, all right; the Master could recognize the Time Lord from a like away, even if he possessed new features. The drums beat painfully in his mind before they caused images, hallucinations to show in his own insane reality, causing him to get to his feet and back up against the wall away from the Doctor, eyes wide.

Looking to the Time Lord before him, his darkened demonic eyes flicked with an even darker and insane undertone to them as his breathing became labored with each breath. That crazed look ever so apparent in his eyes "You shouldn’t be here! You're on your last regeneration allowance, now LEAVE!" his voice dark, foul, and even more sinister than it had been ever. 

Did this mean that somewhere within the Master's mind he still cared? In a sense yes, but also no. It was complicated. His focused angered seemed to only cause the drums to strengthen as a sharp searing pain passed through his skull causing his eyes to close shut as a scream escaped his lips, the pain horrendous enough to the bring the dark haired man to his knees as he held his skull.