A pitcher was allowed to feint toward third (or second) base, and then turn and throw or feint to first base if his pivot foot disengages the rubber after his initial feint.
If, during an attempt to execute the "hidden ball trick" (where the defensive team deceives the runner(s) as to the ball's location while the play is live), the pitcher stands on the rubber prior to the fielder revealing the ball and applying the tag, the runner is not out.