DOG warning
 

I was trail on a throw in on the end line. Team A was making a throw in opposite side of the lane from where I was. A2 was on the nearest lane line from me and moving from FT line toward endline. B2 is defending A2. A2 stops quickly near the end line and B2 overruns her and runs out of bounds, both feet but quickly returns. Is this a delay of Game warning, as it happened 10-15 feet away from where the ball was being inbounded from? I think the letter of the rule is yes but the spirit of the law is no. Your comments and opinions would be appreciated.
Thanks.

The letter of the rule doesn't say yes, either. Leaving the court for an unauthorized reason is a violation.

Logic says B2 wouldn't want to get faked into the stands and you also wouldn't want to stop Team A from potentially getting an easy layup.

Momentum is not an unauthrized reason.

Unless I'm seeing this wrong, this is a violation. Defender crosses the throw in plane.

No, I wouldn't call it as described.

Just making sure I understand you correctly, You think it IS a throw in boundary violation, but you would not call it?

I am not thinking of this play as a leaving the court for an unauthorized reason situation but a Delay of Game. They broke the throw in boundary albeit 15 feet away from the thrower in-er.
The rule I am wondering about is 9-2-10:
The opponent(s) of the thrower shall not have any part of his/her person through the inbounds side of the throw-in boundary-line plane until the ball has been released on a throw-in pass.

Was this a spot throw-in? If so, the boundary of the throw-in spot is only 3 feet wide.

While the throw-in spot is only 3 feet wide the length of the boundary plane remains the same and it is the entire boundary plane to which the rule applies.

It is, and I wouldn't call it because I wouldn't see it from lead and it's not a play I want to get from trail.

The Rain In Spain ...
 

Plane – a flat surface that extends in all directions without end.

http://www.k12opened.com/ebooks/math...mg/plane-t.jpg

While it is this type of violation by the letter of the rule, this is not the type of action intended to be covered by this rule. It is written in the context of a defender covering the thrower and preventing the thrower from being able to make a throw. It was never intended to apply to a player half way down the line that is in no way affecting what the thrower can do. This is not something I'm going to call. Likewise, I'm not calling a violation on a teammate of the thrower for stepping on the line while trying to get open in a similar location.

This is how we called it and was my interpretation of the rule. Just wanted to verify it with those who have been doing this much longer than me. Thanks all.

Camron,
Are you aware that at the NCAA level, the defender can't break the boundary plane until the ball does? So even a defender near the intended recipient of a throw-in pass 25ft away from the thrower would be covered by this rule should the pass be at a sharp angle. In other words, the rule is intended to apply to this at the NCAA level, so I wouldn't be too quick to dismiss it at the HS level.

My apologies for the misinterpretation. I blame lack of sleep...for everything, really :)

There Is None In Heaven ...
 

I always blame beer, for everything, really.