[Lloyd]

I think "let's do it" is irrelevant. It's whether or not exposing his cards while there is still action left should kill his hand. I think not. Exposing his cards does not benefit him at all as giving more information to the BB can only help, not hurt him.

I think there are a couple of options here. The standard ruling would be that the BB can decide whether or not to make the call pre-flop knowing what the SB has. A slightly more creative ruling could be to treat the SB's action as a call, and thus give the BB the chance to see the flop before deciding if he'll put in the few extra chips. A more aggressive version of that would be to require the SB to put all of his chips in the pot (force him to bet the remaining chips on the flop) but allow the BB to make his decision after the flop.