So the umpire got it right because he got it wrong.So Laura Kane confirmed the call not to award a 50m to North in the last was a correct call.
The umpire made an error in not calling play on or directing the player to stand the mark.
Scott, having taken the mark, then took a few steps forward before peddling back.
The direction to bring the ball back to where the mark was, was to clear confusion from the umpire not initially signalling play on or stand the mark.
More salt for salty North fans!