One of my many attempts of re-adding the original spiderwalk scene from The Exorcist back into the film. This version follows more closely to what William Peter Blatty wrote in the novel:
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Chris looked up and froze.
Gliding spiderlike, rapidly, close behind Sharon, her body arched backward in a bow with her head almost touching her feet, was Regan, her tongue flicking quickly in and out of her mouth while she hissed sibilantly like a serpent.
"Sharon?" Chris said numbly, still staring at Regan.
Sharon stopped. So did Regan. Sharon turned and saw nothing. And then screamed as she felt Regan`s tongue snaking out at her ankle.
Chris whitened. "Call that doctor and get him out of bed! Get him now!"
Wherever Sharon moved, Regan would follow.