As a strategy, fear should be realized, understood, respected and even embraced. So it can be used as an asset while never actually getting frightened.
Emotions define our humanity. But it also gets in our way when we need to be operative, thus we must sometimes defer our humanity and be analytic.
Whether it takes a moment, a minute, a month or a lifetime, defer moving against an opponent until you understand their drive of action.
A form of situational awareness, the tactic of reading a room is to determine the patterns of behavior and group mentality in a confined space for direction.