K's ball 4th and 10 from midfield. K punts and R muffs the kick, the ball hits the ground and bounces high into the air at R's 2yd line. While running toward R's goal line K33 leaps and controls the ball over R's 2yd line then comes down with the ball into R's end-zone.
This is a touch back with R getting ball 1st and 10 on it's 20 since K can't advance a muff kicked but didn't gain possession until coming down in end zone?
Another play; . K1’s field-goal attempt hits the ground at team R’s five yardline, is muffed by R2 at his own two yardline, then rolls into the end zone. Six yards deep in the end zone, K3 falls on the ball, what's ruling?