Okay... Good!
You (general collective "you") / We have to know this ruling, cold. Implicitly. Backwards and forwards.
Why?
Watch the video clip again. Yes, the context is young kids playing baseball, and from the size disparity, likely 11U, maybe 12U. Absent the PU missing this (which he obviously did), if the PU doesn't rule on this in a direct, decisive, definitive manner, there will be bedlam. The only way through this is with conviction-of-call, and citing the rule, virtually verbatim.
No daddy-coach, local hire, or even small travel/academy coach knows this/these rule(s), and even if they're aware of it, they don't know the particulars.