The Doctor kept a strong grip on the young girls hand as they sprinted around the corridor and down the darkly lit hallway. Office doors zoomed past them as a threatening growl emitted from behind them. The thing was now in pursuit of them. The Doctor knew that they wouldn't be able to outrun it. They had to find another means of escape. 

Pulling out his sonic screwdriver again, the Doctor aimed his tool at a large metal door with a sign above it reading [i]'Storage'.[/i] The sound of angry steps behind them almost shrouded the Doctor's thoughts as he crashed into the door and quickly opened it, shoving the young girl in first, and then throwing himself in afterwards. He speedily slammed the door shut and aimed the sonic screwdriver at the lock, hearing a satisfactory 'click'.