Predicting and analyzing how the captors are feeling in the hostage situation can help the detainee to react according to the situation. Foreseeing an opportunity of weakness/doubt on the side of the captors can lead to grounds for negotiation on being released.
There already exists training software and extensive research done in the field of micro-expressions. Paul Ekman one of the prominent psychologists of the today has developed the Facial Action Coding System (FACS) to classify every human facial expression and has also created an interactive training called (F.A.C.E training).
F.A.C.E training together with training on cooperation and negotiation would be able to give the detainees the upper hand on evaluating the situation they are faced with and see loop holes of weakness on the captors’ side.