There's a still photo on the other thread that shows Buckley running in a straight line towards the goal. You can tell by the lawnmower tracks on the pitch.
Both incidents are on Player in the 12 odd minutes of highlights. According to Andy Naylor tweets on Saturday, Buckley's head did brush the ball so the second yellow may have been harsh, which is why you see Heaton pointing to Buckley after he caught the ball.
Andy Naylor @AndyNaylorArgus 24...