"The tablets..." Of course, it was obvious and simple and he should have thought of it sooner. He was getting thick and slow in his old age, not to have realised it before now. But there was the possibility the Master hadn't considered it yet either, since he'd had the Doctor at his mercy for several days and now...

Well he probably wasn't thinking too much about things like that right now anyway.

"And how did they break it then, Tara? What happened, as much as you can tell me? What did he do?"