Assertion: quarterback's player | /r/AtLocation | head
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Source sentences:
text: This wasn't meant to be a dead ball, however to keep up with player safety and the horribly vulnerable position a player is in (head facing the defense, laying on the ground), NFL referees have in almost all cases this year declared the player as giving himself up when the QB slides head first (I simply can't remember a non-QB sliding head first that wasn't touched - please comment if there is one).