At 49min in the movie, our hero (in the bank) grabs the bag, and makes a break for the stair to the roof. At the first landing, he pulls the fire alarm. The slip-up...Hero and bad guy fight through crowds of people coming down the stairwell, even though as the chase goes to the roof, there are no access doors to the stairs from the other floors. Were all the escaping people having an office party on the roof??