"Trick" inbound play
 

Inbound play on the endline. All five players come out and line up out of bounds. Player with ball smacks ball and the other four players move onto the court to receive inbound pass. Is this legal? If not, at what point do you call a violation?

Is it after a made or awarded basket?

After a made or awarded basket, this is legal.
The plural "teammates(s)" in 7-5-7a is one reference commonly cited that allows this. Another is 9-2-11: "No teammate of the thrower shall be out of bounds after a designated-spot throw-in begins." That restriction would not apply after a made or awarded basket. Presumably all five players may be OOB off the endline for a throw-in under that circumstance.
And because the video of this has pretty much flown around the FB world several times by now, don't be surprised if a coach or two tries it in one of our games in the future. Worth it to know this so as not to get caught looking dumb. :)

I haven't seen the video, was asked about it by someone who did.

So was I -- and it's legal (as described to me) in NFHS and NCAA.

I saw the video...it was legal.