good point, Integrated. But if Mikail was running away from someone/something, kind of strange that he ran toward the direction where a flare-gun's been shot. not a wise thing to do, right?
perhaps he was watching them and planned his entrance like that (I mean how else to approach? "hey I'm interested what's going on here, let me take a look?") -

OR Mikhail was expecting Naomi, and thought it might be her trying to give a signal. Yes, he did say to Locke and Kate before that communication's been off since the skies turned purple, but 1)are we to take his word (what if there's some secret place with more communication gadgets- like Juliette's ultrasound room. And what if these gadgets ARE somehow normal, or back-to functioning) 2)are we to assume that he never tried re-connecting to the outside world after the explosion- I mean he's the comm. man- I think he'd stay on the job of trying to fix it.
But how did this guy survive anyways??

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"Bear...? Is that you?"-- Hurley S03E4