I understand the (sarcastic) comments about a layup. On the run, the players gets those steps. No problem.
I was speaking more along the lines of a player who has used those steps to come to a stop and establish a pivot foot (instead of shooting), but then decides to take a shot. The rule seems to allow him to switch his pivot foot without a dribble, which I understood to be traveling.
Sounds like what you're all saying is that no matter what has already transpired, the player gets his "layup steps."
But then, why only 1?
