After some quite correct comments on Youtube. (I have the line in the wrong spot) I'm putting up another picture. This one is of when Fotuali'i has just pulled the ball from the ruck. I haven't drawn any lines this time just to let you decide for yourself.
Now in this one the ball has just been pulled from the ruck. Beale has stepped in line with his other players. Who are standing on the line that can be made from TPN's foot.