Here's the play:
YouTube - Mater Dei vs. Etiwanda -- No-call on game-tying three-point attempt
I saw this game and what you have to understand is that this all took place with about 5 seconds left in the game. The ball was being inbounded after a made FT by White. The Black inbound pass was made near the baseline and pass receiver took two dribbles and passed it to a teammate at half-court. The black player who received the pass at halfcourt quickly passed it to his teammate on the wing in front of his bench. What you see is the aftermath from that pass. The final horn went off after the shot was released.
The closest person with a look at the play was the L who was standing on the baseline. The C had to officiate the play (pass to the wing) at half court and when the shot by black went up, the C had about 3 players blocking the view of the attempted shot. The T was still running up in the backcourt about FT line extended.
It was a play where the crew should've known that a 3pt shot was the only play that black was going to attempt. In my opinion, the L should not have been standing at the baseline; he should've have been about 2 feet away from the closest player to him anywhere near the 3pt line. I think he missed because he was too far away from the black player and that the contact happened on the far side of where he could see.