Throw in

[Scrapper1]

Are you asking about NFHS rules or NCAA rules?

You get different results on this play, depending on the ruleset. In neither case is it a technical foul, however. In order to be a technical foul, the defender must make contact with the ball while it's still in the inbounder's hands or while it is being passed to another teammate who is also out of bounds.

In NFHS, your play is perfectly legal. We got a clarification on this a few years ago. Once the throw-in pass is released, the defense may break the plane and make contact.

In NCAA-M, it's a violation for the defender to break the plane before the throw-in pass crosses the boundary plane.