Barbara stood to wonder just what the Doctor was on about for a moment, until she realised he'd wandered off, and the replacement Kessek was giving her a rather menacing stare. Even more menacing than usual which was an accomplishment.

She had to trot to catch up with the Doctor, and even when she was level with him, she still had to walk quite fast.

"What are you thinking?" she asked once they were out of ear shot.