blocked punt

[fastballbaker]

Will you please discuss the ruling on this play...

4th down and 10. The blue team punts the football, but the
black team has a good rush and blocks(deflects) the punt. The football goes straight up in the air and about 10 yards
down field. As the ball is on its way down it hits a player
on the black team on the top of the helmet and shoots down
field even more about 15 yards more. Now the blue team falls
on and recovers the football. Whose football is it blue team
or black team.
Questions: Does it matter where the ball hit the player helmets behind the line of scrimmage or past the line of
scrimmage???
Does it matter if the blue team recoved the ball past the 1st down marker???
This play did happen and I have not found a good ruling yet.....Thanks...