American Football Rules IFAF Approved Ruling 6-1-2:VI

VI. Team A is offside on its free kick and B17 catches the ball at his 15-yard line. B17 returns the ball to his 45-yard line where he fumbles. A67 recovers at the B-47 and runs to the B-35 where he fumbles, with B20 recovering while downed at his 33-yard line. RULING: Foul
by Team A for offside. Team B may choose to have Team A kick again after a five-yard penalty from the previous spot, or Team B may have a first and 10 at its 38-yard line. [Cited by 6-1-2 Penalty]