The mercs were doing their own business.

Spy: looking and reading the newspaper in his smoking room.

Demoman: drinking his beer inside his dorm.

Medic: Medic and Sniper in the office. "This might sting an little.." Sniper: "Okay?.."

Scout: Playing games in his dorm.

Engineer: Building up sentries in his workshop.

Heavy: Eating sandwhich in the kitchen.

Soldier: Singing the American anthem.

Pyro: Playing with his unicorn plush. "Mhmhp!" Translation: "I'll be keeping you safe!"