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Crew Chief is Correct
Sounds like your speaker was giving bad advice.
The relevant rule is 2-40-3:
"The dead-ball spot is the spot under the foremost point of the ball when it becomes dead by rule."
In your case of the runner's knee hitting the ground, the ball becomes dead when his knee hits the ground. The dead-ball spot then is the foremost point of the ball at the moment his knee touched the ground.
-SW---
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