All entry and exit to the building are seized? What about the rooftop? It isn't an entry nor an exit to the building.
When the Shadow team member closed the emergency exit door, Aarvi picked the square-shaped hollow iron block from the floor. After unlocking its one side, she locked the two handles of the door while three men watched her in awe.
They realized that her team prepared everything on her orders. The emergency exit door is too heavy to start with, with the type of custom made lock she was using, it was impossible to break without using electronic metal cutters. So one has to go downstairs to use the emergency exit.
While they were thinking Aarvi might start descending the stairs, the captain of the Shadow team who was watching from a third-person view commented as "Ms. Evans is shrewd." That means she is well prepared and they just have to follow her and protect her.
