He runs flat out back through the park, dragging Padme behind him and ignoring the shouts of the guards for them to slow down. He grabs the TARDIS key from his pocket and jams it into the lock in a single movement.

And nothing happens. The key won't turn.

"It's too late," he says softly, slamming a fist on the door. He spins around and falls back against the TARDIS, sliding down to a sit, his eyes fixed on the key in his hand.