Rufus wroteI think that's your answer. Violation of the throw-in plane. Since the violation occurs before the touching of the ball, no technical and issue a delay of game warning.
Snaqwells wroteRight answer, wrong reasoning.
I wasn't clear, so I've highlighted the incorrect reasoning above.
This is the one play where you can ignore the fact that the ball was touched and simply issue a DOG warning. But, you're not really ignoring it, because it's not against the rules.
Otherwise, as I explained in my post, you can't ignore the technical just because a violation happened before it. If you don't blow your whistle before the defense touches the ball, you have to call the T. The reasoning rufus gave would lead one to believe the following scenario should result in only a DOG warning:
A1 with ball OOB for a throw-in.
B1 reaches across and swings his arms. Official tells him to knock it off. B1 then slaps the ball.
This is a T, regardless of whether a warning has been issued, and a warning is also issued if it has not been already.