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Well, #3 is specifically for a held ball, and #4 is specifically for a foul. (I pulled those off of some website from RefMag, so the specific numbers might vary)
You can use #2 for any other reason -- but given the play in question, what else would it be other than a violation?
And, I would guess that over 90% of varsity coaches in this area will notice the open hand v. fist as much as they would notice the thumbs v. fist, so you're going to have the same (or similar) discussion.
either don't give any signal, or signal what you have. I prefer the latter, but I understand how / why some prefer the former.
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