Tricky blind posting question.

[Spook]

Hand 1: Seat 2 is the BB, and gets up and moves to seat ten after the hand.
Hand 2: Two people immediately sit down, in the 2 and 4 seat. Seat 3 posts his BB, and the deal asks and seat 2 and 4 both post. Button is at the one seat.
Hand 3: Buttin as the the three seat, 4 posts a small blind and 5 doesn't post the BB... cards are dealt and after being dealt 5 objects saying that 3 should have to post a small blind at some point - and that he (5 seat) had no intention of paying the blinds and was just playing out the rest of his free hands.