I watched the video once and a few things that I saw, and take this from a first year official as well:
I'm not sure what the referee was looking at, he isn't involved in the play at all, the player throwing the ball in-bounds isn't part of any action area. And any step over the boundary plane you can clearly see out of your peripheral vision. So as a first year referee, I would think we would more likely miss a player crossing the boundary plane because we were so intent on the two action players. Instead this referee chooses to watch the non action area.
I'm okay with either call, block or charge as this is a bang bang type of play. Personally I'm going with the offensive call. I didn't like the way he reported it. I only watched it once to give initial insight, but I believe he reported the wrong number. Also I didn't like his communication with his partner.
Lastly, I didn't like the jumper by the big kid, wow that shot was ugly
