Interesting!  However, if by 'kill' you mean 'intentionally kill', I don't see the first sort of scenario as a kill one vs. kill five scenario.  If you flip, then you will kill one.  If you don't do anything, then you will let five people die.  Perhaps letting five people die is worse than intentionally killing one, but, as I see it, it's not a kill one vs. kill five sort of scenario.