Don't know how to download the video, it's in the Texas High School Football Officials FB group, but I'll describe it as best as I can.
A punts the ball; B3 signals fair catch (note in the video, you can't see him make the signal, but let's assume for discussion purposes he did, since there's nothing to discuss if he didn't.)
The ball bounces forward off of B4's helmet. Judging from the arc of the ball, it would have hit the ground 4-5 yards directly ahead of B4. A3 is approximately 3-4 yards directly ahead of the receiver, and as the ball boinks past him, he reaches up and catches it. A3 would have had to dive to catch the muffed ball, and probably wouldn't have.
What 's your take?
I *think* I have KCI. By touching the ball, he was not given him the opportunity to complete the catch. Could the receiver have made the catch, probably not, but he is still afforded that opportunity. I think it's kind of the same as illegal touching, if a kick bounces off someone's heel - you may not have meant to, but it still touched you, it's still a violation.