relentlessly, gradually exhausting his limited charge of energy.
Just as the Doctor sprang behind the enormous slab where the Galsec crewmen were tethered, something jumped out of one of his pockets and clattered among the boulders.
‘Doctor... the sonic screwdriver...’ Sarah cried in panic.
The Doctor shook his head emphatically, without taking his eyes off the approaching Styr. ‘I can’t use that, Sarah,’ he cried through the woollen mask. ‘It’s against the Geneva Convention...’ and he gave a long, taunting chuckle which made Styr hiss with fury as he grasped Erak’s end of the Terullian gravity bar and wrenched it free.
The tethers snapped like threads as Styr swung the bar from Krans’s shoulder. The exhausted crewman pitched forward on to Vural in a dead faint. Styr whirled the vibrating bar around his head as if it were just a broomstick.
‘Three hundred kilograms...’ he bellowed, as the bar buzzed through the air a few centimetres from the Doctor’s skull.
‘Very impressive...’ the Doctor murmured, choosing his moment carefully. Then, diving across the slab in a flying tackle, he grasped Styr’s thick waist. Clinging on for all he was worth as the Sontaran stamped about trying to shake him off, the Doctor quickly worked his way round so that he was behind his lumbering opponent. He fumbled among the cluster of controls set into the front of Styr’s belt, and with a sharp jerk, altered the setting of the gravity bar switches.
Styr stopped moving, as if rooted like a tree. The free end of the Terullian bar crashed to the ground; then the other end slowly slipped out of Styr’s fierce grip and crunched on to his broad elephantine boot. He uttered a thunderous roar of pain. The Doctor abruptly turned the switches in the opposite direction and, diving between the Sontaran’s quivering legs, he snatched up the Terullian bar without any apparent effort. Before Styr could react, the Doctor brought the bar down with all his strength on to the back of the Sontaran’s neck—just at the point where a small vent was inserted into the collar.
For a few seconds Styr was completely immobilised. His huge limbs stuck out rigidly at bizarre angles, his vast lungs stopped working and his glowing eyes went dim. The Doctor made the most of his momentary advantage, smashing at the section of Styr’s arm which contained the hidden weapon, and at the instrument panels along his belt. Vivid sparks crackled as the Doctor rapidly wrecked the Sontaran’s armoury of controls.
Without warning, a series of gigantic spasms shook the Alien’s colossal frame. The rubbery lungs resumed their steam-hammer beating and the eyes burned like coals as Styr started forward, grabbing at the flailing gravity bar which the Doctor kept just out of his reach as he hopped from rock to rock up towards the ridge.
Sarah had emerged from her niche among the rocks, and was watching, heart in mouth, as the Doctor backed up the narrow ridge, forcing the gradually weakening Styr to flounder in pursuit. She knew that the Doctor could not possibly keep up his dangerous tactics much longer. Unless Harry returned very soon with his mission accomplished, it seemed as if all would be lost. She could hardly bring herself to look as the Doctor leaped along the precipitous spine of rock, taunting the gasping Alien with the Terullian rod.
A moan from the semi-conscious Krans nearby prompted Sarah into action. She ran across and tugged at the thin strands of Terullian binding the three exhausted crewmen to the slab, but they could do little to help her in her frantic efforts to release them. Suddenly she thought of the sonic-screwdriver, and quickly located it between the rocks where it had fallen. Studying the familiar, but extremely dangerous instrument, Sarah tried to remember how the Doctor operated it—she had watched him many times, but knew that the slightest mistake could be fatal.
Sarah set the combination switches along the handle
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