Scott's playing partner, Keegan Bradley, had looked out of contention after dropping three shots in the first three holes and carding further bogeys on the 10th and 11th but he birdied the 12th, 16th and 17th and narrowly missed from 30ft for another on the last to force a play-off.
Scott had bogeyed the 1st after twice finding sand and a hooked drive into the water on the 3rd cost him another bogey.
The 33-year-old steadied the ship with a chip to four feet to set up a birdie on the par-five 4th but then bogeyed the 7th after his tee shot plugged in a greenside bunker.
Scott had held the outright lead since the early stages of his opening round on Thursday but that was no longer the case when Every recovered from a bogey on the 8th with birdies at the 9th, 10th and 12th to take the lead.
Scott's tee shot came up well short of the green but he elected to putt through the fringe, running his birdie attempt seven feet past the hole and missing the return.
A massive swing looked on the cards on the 16th when Every pushed his tee shot into the trees and failed to find the fairway with his escape shot, eventually making a bogey six. Every then found a greenside bunker on the 17th but saved par after his recovery shot slammed into the pin and somehow stayed out. Scott's challenge ended when he failed to save par from the same bunker but Bradley fired a superb approach to 10ft and holed for birdie.