A definitive answer - sort of

[JugglingReferee]

Let's try this one.

A has a frontcourt endline throw-in at the close down position. A sets up a 3-person wall parallel to the sideline. Defense is stupid and doesn't have someone on either side of the wall. Ball is passed to the middle guy, who passes to the thrower-in who is now behind the 3-point line. A defender on the key side of the wall, which is very near the endline, goes around the wall by stepping OOB. Let's even say quite a bit OOB for arguments sake. That is, both feet stepped OOB, if only one of them a few inches.

Do you call a T? A player voluntarily left the playing area to gain an obvious advantage.

Let's say that it's near the end of the 4th quarter, A down by 2 with a good shooter as the thrower-in. B1 steps OOB to go around the wall, and even jumps to block the 3-point shot by A and gets a piece of the ball. Do you call a T here?

Just throwing it out there.