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The Reds did manage to level the contest on the brink of half time through Jamie Mackie who converted Jamie Patterson's cross, but Wednesday hit back instantly when Lewis Buxton bundled home a corner to give regain Wednesday's lead going into the interval.
Twelve minutes into the second half Joe Mattock extended his side's advantage when he drilled the ball home following a short corner.
Forest had numerous penalty appeals turned down as they went in search of a goal, but Leon Best nearly put the game beyond the hosts when he narrowly fired over from a Maguire corner.
Collins was dismissed soon after for a second bookable offence, though Paterson stepped up to curl a 25-yard free kick past Chris Kirkland to snatch a point for Forest in the closing stages to secure a dramatic point.