Pitcher's windup motion

[BLWizzRanger]

NFHS ruleset.

I had a 13U pitcher starting with his feet in a windup position.  Both hands were at their sides.  He would swing back his hands as he took a step backwards and then bring his hands together as his knee rose.

Looking at OBR, the official windup position starts when he brings his hands together in front of him and then he can take his windup steps.

Looking at NFHS, the pitcher is allowed to make 'no more than two pumps or rotations' when starting his windup.  This wasn't a rotation so I can eliminate this.  But what is a 'pump'?  Is it the movement of taking his hands above his head (while together) - this is the only reference I can see for 'pumping' - or as I described above?  For some reason, I sort of remember seeing much older pro pitchers swinging their hands behind them when starting their motion.  Was this considered a pump?

Hopefully, i don't see this again but I will have a hard time sleeping not knowing this...

[Jimurray]

33 minutes ago, BLWizzRanger said:

NFHS ruleset.

I had a 13U pitcher starting with his feet in a windup position.  Both hands were at their sides.  He would swing back his hands as he took a step backwards and then bring his hands together as his knee rose.

Looking at OBR, the official windup position starts when he brings his hands together in front of him and then he can take his windup steps.

Looking at NFHS, the pitcher is allowed to make 'no more than two pumps or rotations' when starting his windup.  This wasn't a rotation so I can eliminate this.  But what is a 'pump'?  Is it the movement of taking his hands above his head (while together) - this is the only reference I can see for 'pumping' - or as I described above?  For some reason, I sort of remember seeing much older pro pitchers swinging their hands behind them when starting their motion.  Was this considered a pump?

Hopefully, i don't see this again but I will have a hard time sleeping not knowing this...

Figure out what you think is the time of pitch and go to sleep. Hint, any motion associated with his delivery is the start of his pitch (yes FED has a glitch). See you in the morning.

[Senor Azul]

2019 NFHS Case Book Play 6.1.2 Situation B:  What is meant by a pump or rotation? RULING:  A pump or rotation is a movement of the arms, by a pitcher when in the windup position, immediately prior to delivering a pitch to the batter. The pump is an alternate downward and upward motion of the arms generally terminated by placing both hands together. A rotation is a circular movement of the pitching arm immediately prior to delivery to the batter during the windup position. The rules limit a pitcher to not more than two pumps or rotations when using the windup position.