Read NFHS rule 10-6-1, especially the part that says "a player shall not.... impede the progress of an opponent...by bending the body into any other than a normal position". In this case, if you feel that the screener is gaining an extra advantage by bending over and taking up more space than his normal screening stance would take, then call him on it if contact occurs. There's not really that much difference in the screener extending his butt backwards and his head/shoulders forwards instead of him extending an arm or leg sideways, is there? Contact outside the torso should still be called on the screener.
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