Rule 2-4-1 The new definition that “clarified a catch” made it murky for me.
Per the new rule -- one of things that makes “a catch is the act of establishing player possession of a live ball which is in flight, and having the forward progress of the player in possession stopped while the opponent is carrying the player who is in possession and inbounds.” The comments on the new rules, and the case book, and Reddings refer to situations where the airborne player trying to catch the ball is carried out of bounds – either forward or backward. If he is carried out backward it is a catch – forward and it is incomplete.
I understand that if he is airborne when he first possesses the ball and then “tackled or hit and driven” any direction he must have control of the ball when he contacts the ground inbounds to complete the catch. If he first touches the ground out-of-bounds the pass is incomplete.
But, I’m not yet clear on exactly when the pass is complete on the carried situations.
a) Per the comments on the 2013 changes on page 4 – “An airborne player who has forward progress stopped inbounds and is carried out of bounds by an opponent before contacting the ground is awarded a catch at the spot of forward progress.” I assume that he must have possession of the ball when the opponent touches out-of-bounds. If he loses control of the ball just after the opponent touches O.B. it is still a catch.
b) What if the attempted catch and carry happen away from the sideline? An airborne receiver possesses the ball and then he is contacted and carried 3 or 4 steps. 1) If he is carried forward I think it is clear that the play is alive and he must still have possession of the ball when he first touches the ground inbounds. 2) What if he is carried backwards for 3 or 4 steps inbounds? What if he loses control of the ball on the 2nd step, or the 3rd?
After all of that I guess my question is --- when is a catch completed if the airborne receiver is carried (but not out-of-bounds)

? When is the play dead by rule? (please don't say when the whistle is blown)