Svetlana was the one that 'suggested' Las go to Kazakhstan.
We know Sveta is both strongly precognitive and excellent at reading probability lines. She also knows much of what happened at the Assol complex. It's entirely possible she foresaw Anton would need a lift and persuaded Las to get the right train, knowing he would get off at the same spot after the spell wore off.As for why she went to the trouble of calling him, that allows her to cast a weaker (and thus less detectable) spell while also deflecting suspicion away from herself.
- I think it was clearly stated that it was Kostya who glamoured Las to go to Kazakhstan so that the suspicion would immediately fall on the latter due to his connection to the Assol case.
Olga has swapped bodies with men quite often already.
This is a Wild Mass Guess for the Day Watch movie, and it is quite a small one. But based on the way Olga was preparing herself to be strangled from behind and the fact that she is already comfortable with passing for Anton among his colleagues, it seems like Olga must have done this before. It makes sense, since she has been a Night Watch agent for a long time, working under Geser and being a pretty close friend of his, that she was his go-to person for mind-swapping a person as a decoy.- Not to mention knowing the way around the wrong voice. And she was remarkably comfortable with him feeling his/her breasts/ass/groin. Then she let him go off with his girlfriend, knowing he was almost certain to let her in on the secret.
