Sentence:  There was also true courtroom suspense — a Perry Mason moment that could have cost me the whole trial. I made a <WSD>game-time decision</WSD> to ask Earle Caldwell's girlfriend a question nobody had ever asked her before: Did she believe that Caldwell and Blake were responsible for Bonny's murder? 
Meaning of the word marked with <WSD> tags:  By extension, any decision that is put off until a point where it can no longer be delayed.