Is the NFL ever going to use logic with its replay rules?

[bisonlj]

Originally Posted by hbk314

Can they review that part of the play in the context of reviewing a scoring play, but not when a coach wants to challenge?

It depends on whether they ruled the first action as possession in your hypothetical. If they did then they could have determined his knee was down before the ball was pitched. If they didn't rule on the field he had possession (like in the actual play), then that part of it would not be reviewable for the same reasons the actual play was not reviewable.