The latest rule revision, the receiver must now establish himself as a “runner.” as opposed to a "football move".
Although a bit better it's still too ambiguous. Two feet down and
possession of ball isn't that enough you fucking idiots.except in the
end zone where it is. Then there is the Bert Emanuel rule that if you
have possession of the ball the ball can touch the ground and is still a
catch, UNLESS it's in the end zone where it's an incompletion (don't
believe me ask Calvin Johnson). So you can have the ball touch the
ground as long as you're in possession and in the field of play but not
in the end zone and two feet down and possession of ball is a completion
in the end zone but in the field of play you have to establish yourself
as a runner. Fucking idiots