He was provided with information, so he would not be caught unawares. Would his testimony change? Not if he is an honest, professional man. Which he is. Except perhaps his sense of anger may have been agitated somewhat.   The main thing is, if you are in for a real beating, but you can prep your mind and body for it, you can withstand the onslaught. As Q explains, the goal was to beat him and beat him until he folded, and collapsed, and resigned from the process.   KNowing what was going on would have provided him with opportunity to mentally prepare, and resist.