Not sure
 

I'm not sure I understand. Doesn't team control only apply if there is a foul by the throw-in team? My thinking is if the IW occurred after the throw-in hit the bottom edge and before the ball was legally touched then the POI would be a throw-in for Team A not on the basis of team control; but as tjones suggested: the throw-in had not ended. Now, if the ball hits the bottom edge > touches or is touched by a player (throw-in ends) > the IW occurs, POI > go to the AP? Similar to if an IW whistle occurs when a try is in flight > the try is unsuccessful (the try ends) > go to the AP. Help on this would be appreciated.

Honestly, this is a good point. Any speculation on how the NFHS would rule would be, frankly, like rolling dice.

No.

TC does end when a try is in flight.

See 4-12-3

I agree and some really good officials I know have argued the other side.

Absent written instructions, though, we only have the team control rules to go by.

To be honest, that's why I posted the situation in the first place and it was the same thing I was thinking as he came in and called it. I wish he would have left it alone.

It didn't go straight back, it might have gone at a slight angle toward the endline, but not much. I'm pretty sure it hit the corner of the padding on the bottom of the backboard.

Doesn't matter

Matters

I'm sure it did. If it hit only the back, it would have rebounded straight back (and probably "up" as well, initially.) If it hit only the bottom it would have rebounded farther onto the court. The rule doesn't tell us specifically what to do if it hits the corner -- so most of us use the rule I've outlined above -- if it goes back at all it hit "enough" of the back to be a violation.

imo, of course -- and I agree that it's hard to get from T.

AP posession
 

Let me just add one more dynamic to this. A has AP throwin, it hits the bottom of the backboard and IW before it is touched. Does A retain the arrow or does it switch?

Your title....alternating possession possession?

In this case, POI is the AP throw in, so the AP arrow would switch after the second throw in is completed.

Team control only exists during a throw in for the purposes of administrating a foul, even though this is a poorly worded rule. If the throw in hits the back of the backboard. Team B gets the ball. If this is on an AP throw in, won't the arrow switch, team A looses the arrow because of a violation?

Yes

Correct. Throwin violation on A for not throwing it directly onto the court before going OOB.

When does the arrow switch? 6-4-4 and 4-42-5

I'm not sure I agree. Do you have a reference? (It's a convenient "shortcut" to remembering the most usual situations, but I don't think it's universal.)

This part is correct. Same references as above, plus 6-4-5

Question:

AP throw-in; B2 deflects throw-in; ball hits bottom of backboard; inadvertent whistle.

How do we handle this situation?

AP throw-in has ended, so AP arrow changes immediately. But do we still have TC by A, or does TC not apply to throw-in outside of fouls?

Now I know why you call yourself BadNews...LOL