The ball becomes dead in the end zone when A's player gets the ball, or not? Can i enforce in the end of the run?
Guilherme,
First, the pure result of the play is, indeed, a touchback, which would yield A, 1/10, A-20, since the impetus that caused the ball to be in A’s end zone when it became dead is the batting of the ball by Team B. As a side note, the legal recovery by A of the legally kicked ball that had crossed the neutral zone (legal, because B had touched the ball when they batted it) does, in fact, end the kick play, and, technically, creates a running play, although the running play starts and ends simultaneously (also ending the down)).
Next, let’s consider the batting by Team B. The ball was batted forward by B, so, thus, was illegal, and a foul. As Kalle indicated, this is a Basic Spot enforcement foul that occurred during the
kick play portion of a legal scrimmage kick down (not during the technical running play that occurred when A recovered the ball in the end zone). The Basic Spot for fouls that occur during a legal scrimmage kick
play is the previous spot, with application of the 3-and-1 principle related to that spot. Since the foul was by the opponent of the team in possession, the penalty, if accepted, would be enforced at the Basic Spot. After the 10-yard distance penalty the down would be repeated, A, 4/7, A-23.
Again, as Kalle indicated, A would most likely decline the penalty, and take the result of the play. There might be some game situation circumstances in which they would accept the penalty, but they would be quite rare.
Note: In either case, due to the legal kick down, the play clock is 25/RFP, and the game clock starts on the next snap.
Robert