Quote Originally Posted by Humphrind
I would imagine that SB had a K or A but was scared of the flush. BB bought him out of the pot, but had to show his bluff because you were all-in.
Which is my point, sort of - I'm assuming the SB had something good to call the preflop raise, but why bluff that big on the flop as the BB if you're not picking up any side pot chips?

If I moved in, he has to figure I've at least got a high pair by this point. Therefore, the BB has to know he's behind me. With the call, he probably has to figure he's behind the SB as well - why risk the possibility that the SB hit and is just checking to induce a bet when you have a hand that:

a) Is probably losing already
b) Has almost no possibility of improving without helping someone else