It was a mad, impossible dash across the hanger and despite how much he wished River wouldn't be so -- so disturbingly willing to shoot things, she's the reason they even make it across from one end to the other.

The cables and conduits dragged and rattled against the floor. The Doctor skidded to a stop behind the Master, boots sliding as he glanced over his shoulder. He could see River, just barely, at the end of the hanger, the door of the TARDIS pulsing pink as her rifle flashed and winked and strobed in the distance. The Ohm only meters away from chomping his head off crumpled into a heap. They had only moments to spare, the Doctor right behind the Master as he made some last minute repairs on the conduit behind the accelerator.

It was up to the Master to finish the job.