Illegal Pitch or not?

[mcrowder]

I'd love to know exactly what rule the umpire thought he was using to enforce this. I've found that for the most part there are 3 types of umpires regarding illegal pitches.

Group 1 - the vast minority: Knows all of the rules, calls IP when someone violates the rules.

Group 2 - about 48%: Knows most of the rules, but never calls an IP unless a coach complains or the pitcher falls down.

Group 3 - about 48%: Knows a few of the rules, makes up reasons to call IP to make themselves feel like they appear to know what they are talking about. Most coaches that don't have great pitchers fall into this category.