Pepper rushed to the door but it was sealed shut. It was the only way out of the lab and soon enough she caught sight of Tony on the otherside looking panicked. "JARVIS open the door!" she shouted but there was no response, she attempted to put her password into the machine but it had rejected it. The shutters had also stopped moving as the power went out completely. 

"Sir my main frame system has been overrided, we are now using our backup generator but I have lost control of this building," JARVIS reported. "An intruder is already inside, though I am not sure of his exact whereabouts," he added.