The Doctor sees it, too. He scurries along the side of the ledge towards the machine.

"I think the machine is working on its last ditch efforts," he says, pulling out his sonic and waving it over the controls. "I might be able to disconnect the laser function from the androids, but I won't be able to hold them all---"

There's a bang at the front door. And another bang at the back. They don't sound like anything remotely friendly.

He hops to the ledge and offers his noninjured arm for Morgana.