Who cares what happened between Arsenal and Anderlecht we all prefer proper football, The Championship?
That encroachment rule on penalties is NEVER enforced. I'd be interested to see if a ref would actually overrule a goal if an encroaching player tucked away the rebound - you'd hope it would be, but I wouldn't bet on it. Just as if a defender managed to get to the rebound and clear it after encroaching, you'd hope the ref would order the pen to be retaken...but otherwise, if the pen is scored it just seems anything goes as far as encroachment is concerned. Its a rule that is simply ignored if a goal is scored - quite honestly, we might just as well get rid of the D on the edge of the area. Whats the point of it.
Never?
Maybe one time in a fasand then. And thats only because the ref is showing off.