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A deflection barrier was a form of force field technology. When an object made contact with the barrier, it would be deflected from the barrier at the same kinetic force. The Fourth Doctor described walking into one as "walking into a brick wall". (TV: Pyramids of Mars [+]Loading...["Pyramids of Mars (TV story)"]
Sutekh set up a deflection barrier around the Scarman priory to guard it whilst constructing an Osiran war missile. The reanimated corpse of Marcus Scarman and the Servitors set up four generator loops in each compass point in the area. Ernie Clements, who'd been poaching near the priory whilst it was set up, was trapped in the priory's because of the deflection barrier. The Fourth Doctor eventually disabled the eastern point of the barrier by shutting down its generator loop using his sonic screwdriver. (TV: Pyramids of Mars [+]Loading...["Pyramids of Mars (TV story)"]