Joe thought it was best to remain silent unless asked directly, since all relevant information for a mission is either provided in the briefing beforehand or by the NC's computers once the communications were established.

To protect against the cold Joe had simply retracted his arms from the sleeves of his jacket; it looked strange but was effective.
He used the time to think about how to deliver as much damage as possible while taking the least amount of damage, and since the best way to not take damage is to not be detected, he ended up thinking about how he could establish a LoS(Line of Sight) to his target without being seen himself.

Still, Joe listened to what the other said, even though he didn't focus on it, information is information after all.