I think the most important aspect, Jim, is to concentrate on the pivot foot. Know if it's a pitch or a throw. That is, did F1 disengage backward? Did he come forward off the rubber with the pivot foot before stepping to throw? Or, did he merely speed up his delivery motion (which is allowable) and properly step with his nonpivot foot? Of course, all this assumes that F1 is in the windup stance, and the batter is prepared to bat. If the batter is not ready and the pitch is delivered, then you have a quick pitch if F1 didn't disengage.
If F1 is in stretch---a highly unlikely situation where R3 would be breaking to the plate---you must be certain a stop is properly made if F1 delivers from the rubber.
Bottom line, too many variables depend primarily on what F1 does with his pivot foot in his initial reaction to R3 breaking to the plate.
Just my opinion,
Freix
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