There are all kinds of different circumstances here. I have blown a play dead as soon as the player went down and I have also waited for quite some time to kill the play. You just have to be the judge of how detrimental it is to the player. If it is just a turned ankle, do you think the game can continue without the player having immediate help or attention? What about a play where the player goes down and slams there head violently on the floor? Maybe a different situation there? Overall this is all based on your judgement as an official.
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