Here is where the actor's script analysis work really begins. Acting is the performance of actions. One cannot perform an emotion or intention. Emotions and intentions are internal experiences. Fear is an emotion.
Emotions are internal experiences.
One needs to perform actions to outwardly express the internal experience of fear. In fact, there are many, many ways that you can outwardly express the internal experience of fear. Likewise, one cannot perform an intention. One needs to perform actions to outwardly express the intention. Without such actions, the audience would have no idea what a character might be thinking.