Just read that in the IFAB book. Games going mad! Lewandoski can stop 4 times in his run up, keeper is fooled by the feint, no foot on line, saved penalty is then retaken.The rule says you can stop in the run-up but not from the point you plant your non-kicking foot.
Law 14.2: feinting to kick the ball once the kicker has completed the run-up (feinting in the run-up is permitted)