Mafia 83. Doctor Who: Aliens in London

Does your team have aliens? - Yes

It seems to me that this is a question about a faction. The first question is whether you are a resident of London. The second is whether you are a Guest from space. The third is whether you look like a yeti. The questions are indeed mutually exclusive. 1. If 2 and 3 are true, then Parazon is one of the residents of London. It is only unclear why he would lie about it. 2. If 1 and 3 are true, then Parazon is a yeti. 3. If 1 and 2 are true, it is impossible.