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Another possibility is that the kid felt it dropping out of the backpack and grabbed for it. We know where that can lead.

It would be interesting and I hope that LEOs know the answer to a couple of key questions.

1. The kid did or did not know that the gun was in the backpack. Like another speculator, I suspect that someone else put it there to put it out of range of a search. Even if the kid did know it was there, it could still have been put there by an older friend or relative.
2. Are there any suspected gang members living in the same residence as the kid with the backpack? That could very well answer the source of the gun and how the kid got it. We all know that gang members purchase their guns using the required background check so it out to be easy to find out who originally bought it (Not!)