Forward Progress Airborne
It is first and 10 for A at B's 12-yard line. A1 sprints near the end line
and then buttonhooks. He jumps and possesses a forward pass wile in the air
above the end zone. (a)A1's momentum carries him back into the field of play
and he lands and is downed on the 1-yard line; or (b) while in the air in the
end zone, he is contacted by B1 and he then lands and is downed on B's 2-yard
line.
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Ruling: In (a), it is A's ball first and goal at B's 1-yard line. In (b), it is
a touchdown if the covering official judges the contact by B1 is the cause of A1
coming down at the 2-yard line, instead of in the end zone.(2.15.1)Casebook