The "hazards" thing - it's not too uncommon for a car to yield out of turn (for example, to allow a car pulling out of a driveway) - I do this sometimes, particularly if it seems like the road is busy and the person would have to wait a while for a clearing to pull through.
The blinking hazards thing might be that driver's way of saying "I'm stopping for a reason, don't just pass around me on the left" as will sometimes happen when you stop for a pedestrian crossing the street. Someone pulls around you and WHAM, nearly hits the very person you were trying to allow to cross.
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