You are doing great!
For a 2nd year guy you certainly have a healthy dose of professional skepticism...
I posed this very same question to 2 veterans a couple of years ago and one of them came up with this variation...
Lets say that B leaps at the back of the endzone and gains possession of the pass but first lands out of bounds beyond the end line. You would have an incomplete pass right? The catch was not completed in bounds. (Of course you might have a catch if contact by an opponent is involved, but that is for another discussion because you can have all sorts of variations on that one).
Same principal can be used in your situation. The catch was completed where B first lands with the pass in his possession. If that is the end zone, then the momentum exception would not apply. If the ball becomes dead in the end zone with B in possession (player or team) then you have a touchback.
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Mike Simonds
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