David Wagner accused referee Lee Mason of costing Huddersfield a precious Premier League win at Cardiff after he overturned his decision to award the Terriers a 76th-minute penalty.
Wagner, who left the club by mutual consent on Monday evening, saw his Huddersfield side end a run of nine successive defeats with a battling 0-0 draw against their fellow relegation strugglers.
Yet one point could have turned into three, but for Mason changing his mind over giving the Terriers a penalty when full-back Florent Hadergjonaj tumbled.
Mason spoke to his assistant Stuart Burt before reversing his decision, instead awarding a free-kick to Cardiff for Hadergjonaj pushing Joe Bennett before the Switzerland international fell in the box. But was the correct decision made?
Hit play on the link above to watch the incident and decide for yourself.