In my short time in the biz, I cant say I have seen many screens set from behind. Of those I have seen, there was a step or so given and incidental or no contact. But the offense did a poor job setting it up. Most screens have been on the side. But most of the kids yell screen to each other to warn when they are setting. Most of my screening calls have been for forearms or stepping out of their body width, such as hips, legs extended as the player goes by.
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