In a HS game, we should have a whistle 99% of the time there is a crash and bodies are on the floor. If you are 110% certain it was a foul, I would get it. Getting a block charge wrong at the beginning of the game is bad. Not having a whistle on a block/charge on the first play of the game is recipe for a rough and out of control game.
Whether you are the 'R' or not shouldn't have any bearing on whether you make the call. I think another factor to consider whether you come in and get the call depends upon the level of experience of your partners. A rookie may not know how to react to that play.
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