If you don't have any control over him anymore, I'll find another way to deal with him. I found him on my roof waiting for the Doctor and had to shoot him to get him off; there's no way in hell I'm going to let him keep lurking around my home and the Doctor. I'm not going to let him possess anyone either, least of all you or the Doctor.

Be careful with him, Montague. Carry a gun if you confront him. Like I said, bullets can hurt him. I got a sample of his blood and I'm analyzing it now. I'll let you know what I find.