Mafia 83. Doctor Who: Aliens in London

I don't quite understand, is this some kind of ND, or is Yashchur a doctor and a master?

Yashchur has been injured (but that doesn't mean he's no longer the Lord of Time), and Ment has either been killed or sent for regeneration.

Added 3 minutes later

Perhaps Ruddy was going to kill, but didn't reach his target. The Dalek scout kills before the Cyberman.

Perhaps. Then either the Primals killed Ment, or the killer of the Primals was hiding in the block.