NF: 4.2.2.a; "The ball becomes dead and the down is ended; (a) When a runner goes out of bounds, is held so his forward progress is stopped or allows any part of his person other than hand or foot to touch the ground."
When any player (there is no definition of "punter") possesses a live ball with his knee (or any other part of his body other than hand or foot) on the ground, he becomes a "runner" (NF:2.32.13) and the ball is dead.
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