2 play situations

[Reffing Rev.]

In the OP the snap went into the end zone...force is a A/K's snap, meaning we will either have a safety against A/K or a touchdown for B/R (assuming they get possession)

What happens after the ball goes into the end zone cannot change the force that put it there.

R's kick assuming that the OPer meant an intentional act of kicking, then all-but-one 15 yards from previous spot or decline it for a safety.

If though instead and more likely R's kick was inadvertant to an attempt to recover for a touchdown, then when the ball goes out of the end zone it is a safety, as R's touching is nothing more than a muff on a ball K's responsible for putting in the end zone.