For the foretell ability of the foresight school of divination, it says that you can utter a prediction of the immediate future. Then your allies gain a bonus or your enemies get a penalty. In order to generate the bonus and penalty, does the player of the wizard have to actually make a prediction in real life and only if this prediction comes true does the bonus or penalty take effect? Or is the prediction descriptive fluff, meaning the player can assume he generates the bonus or penalty without making the prediction in real life?