The center and QB still have to complete the snap successfully though so I'm not sure what good this accomplishes.
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Provided the QB established possession. But what are you really saving in that fraction of a second it takes to kneel down? You aren’t saving more than a single second of time.
Besides the holder I rarely see it in a player. The refs on the other hand are on their knees some plays, mainly when they're blowing the game.
Didn’t a kick returner lay flat in the end zone then stand up get the ball and make a decent return? Vikings I think?
Obviously different than a snap, but player starting the play down.
A QB taking a snap on his knees would be much harder than if he's standing. He would have to hold his hands funny. It would lead to more fumbles than less.