Traveling / Post moves

[mdrd]

Several officials and coaches I know have different takes on traveling for low post moves.

The player pivots on right foot faces the defense pump fakes, rake through then steps through with the left foot, picks up right foot shoots the ball before the right foot touches the floor. Most I know do not call this traveling

But if the same player wiith right pivot foot steps up the lane then whips or reverses the pivot back down the lane with the left foot picks up the right foot shoots before the right hits the ground (tail whip)....Traveling.

What is the correct call?