See, that's the thing Hawt, this could be construed as honest on both party's actions, or it could be considered an angle-shoot by either side. Player A says 'I think I have to call' to induce action without really meaning to call, then says "I fold" once he gets the result he wanted (player B to expose his cards). NOT SAYING THIS IS WHAT HAPPENED HERE.
Or, player B, upon hearing player A debating a call and hearing the word "call" come out of the other player's mouth in any fashion quickly exposes his hand, forcing the action and a response from the dealer/floor.
Interesting situation. I still believe in most casino's you'd be held to the call. As for the honesty/angle-shooting, there's lots of honest players, andd there's lots of angle shooters as well. Pick your poison.