to create a sophisticated mechanical creature, Winston opted to create a hand puppet. A cast was made of makeup artist Lance Anderson's arm and head, around which the Dog-Thing was sculpted in oil-based clay. The final foam-latex puppet, worn by Anderson, featured radio-controlled eyes and cable-controlled legs, and was operated from below a raised set on which the kennel was built. Slime from the puppet would leak onto Anderson during the two days it took to film the scene, and he had to wear a helmet to protect himself from the explosive squibs simulating gunfire. Anderson pulled the tentacles into the Dog-Thing and reverse motion was used to create the effect of them slithering from its body. Winston refused to be credited for his work, insisting that Bottin deserved sole credit; Winston was given a "thank you" in the credits instead. In the "chest chomp" scene, Dr. Copper attempts to revive Norris with a defibrillator. Revealing himself as the Thing, Norris-Thing's chest transforms into a large mouth that severs Copper's arms. Bottin accomplished this scene by recruiting a double amputee and fitting him with prosthetic arms filled with wax bones, rubber veins and Jell-O. The arms were then placed into the practical "stomach mouth" where the mechanical jaws clamped down on them, at which point the actor pulled away, severing the false arms. The effect of the Norris-Thing's head detaching from the body to save itself took many months of testing before Bottin was satisfied enough to film it. The scene involved a fire effect, but the crew were unaware that fumes from the rubber foam chemicals inside the puppet were flammable. The fire ignited the fumes, creating a large fireball that engulfed the puppet. It suffered only minimal damage after the fire had been put out, and the crew successfully filmed the scene. Stop-motion expert Randall William Cook developed a sequence for the end of the film where MacReady is confronted by the gigantic Blair-Thing. Cook created a miniature model of the set and filmed wide-angle shots of the monster in stop motion, but Carpenter was not convinced by the effect and used only a few seconds of it. It took fifty people to operate the actual Blair-Thing puppet. The production intended to use a camera centrifugea rotating drum with a fixed camera platformfor the Palmer-Thing scene, allowing him to seem to run straight up the wall and across