‘Doctor... I thought you were...’ he stammered. ‘It wouldn’t have worked, Harry,’ the Doctor whispered, ‘not unless you had hit him exactly in the right spot.’ He gave Harry a sharp tap on the back of his neck. ‘There. That’s a Sontaran’s Achilles Heel.’ ‘Thanks for the tip,’ Harry murmured, still recovering from his fright. ‘I’ll try to remember that.’ The Doctor released Harry and began to rummage about in his overflowing pockets, muttering quietly away to himself. ‘But I thought you were a goner,’ Harry exclaimed, filled with shame at having abandoned the Doctor. ‘I was quite sure there was nothing I...’ The Doctor put his finger to his lips. ‘I was merely relaxing, Harry,’ he grinned. ‘An old Tibetan trick at times of unusual stress : it helps to clear the mind.’ ‘Well, I must get you to teach me sometime,’ Harry said, shaking his head in disbelief. The Doctor was busily turning out an extraordinary assortment of objects into his upturned hat: marbles, pieces of twisted wire, shrivelled jelly babies, weird keys, a pirate’s eye-patch, strange coins, sea shells, a dead beetle...
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