Onside kick rule question

[Mingram]

Team A attempts an onside kick. The ball bounces off the ground, high in the air. Team B player, 8 yards downfield, camps under the ball to catch it. Before he can catch it, Team A player blocks him. The ball hits the ground and bounces beyond the 10-yard limit where it is recovered by Team A. I say no foul because once the ball hits the ground (right off the tee), no fair catch or opportunity to catch is involved. Free ball.