This girl certainly was not Althea, at least not in how she acted. This girl was a weapon, a fighter much like he had been once. If only they'd had her in the Time War...no, that wouldn't have made a difference. Not when so many people on the front lines were dying endless deaths time and time again. Not with all the atrocities that had been born. Not with the scenes he had seen with his own eyes that had frightened him. Him who had been the perfect warrior for such a war.
And now what was he doing? Creating a new war here on Earth? Why not? Chaos was his realm. And he would revel in it and no longer deny what he really was. He would not fight against what he was simply because Romana wanted him to. It was definitely not enough. No, he'd need another 900 years to undo the first 900, and even he doubted he could finagle his remaining regenerations to last that long.
When she shot at him again, the Master ducked out of the way. After all, he did not want to take a bullet to any part of his body, let alone two bullets aimed for his hearts. No, he was not going to die here. Not today. She would not be the one to take him down.
"Really, little girl. You are not the one to kill me." If anyone was going to kill him, it would be one of the Doctors. And with that said, the Master called forth not only the entire brain washed staff of this lab, but also called for any nearby Autons to come inside to assist. They would subdue River one way or another. And if he saw that was going ill, he would use Simon to get her to stop. He wasn't exactly sure how yet, but he would figure it out if it came to that.