Endurance

You focus on the ground and you see the man walking away from Nick to the table. You feel your heartbeat increasing rapidly. You know what he's going to do now, you know that he's looking for a "tool" to torture Nick, so he would talk. You wish deep in your heart that he would just tell them what they need to hear but then you remember who Nick is. 

He's the top of the top. He knows things that most of the soldiers don't know. He's been trained by the best and now he's the best. If they break him, they could get top-secret information and that could be disastrous. The responsibility that's resting on his shoulders is immensely heavy to carry. He's not allowed to break and because he's not allowed, that would mean that you can't break either.