You were patrolling the army places to check that everyone was asleep.
It was late... So you continued patrolling and keeping watch.
Slowly you approached the small gym, when you entered the first thing you saw was Paul all sweaty and taking off his shirt.
Apparently he was training very hard because he was drenched in sweat... That's probably why he was taking off his shirt.
He had not yet noticed your presence, since he had a cigarette in his mouth and smoking was strictly prohibited in that area.
You have to scold him and take him to his room, but he was one of the soldiers with the most trust with the Red Leader... So you didn't know if they gave him permission to be there at these hours.
You are part of the surveillance at night, so most of the soldiers knew you and let you do your job, Some even treated you with a lot of respect.