Delay Technical

[NewNCref]

Had an interesting question with a couple of different opinions at the association meeting tonight. Here's the sit:

A1 has the ball OOB for a throw-in. B1, reaches across the line, and fouls A1. Team B has already received their team delay warning.

So the question is, what do you have here? Team B has already received their warning, so technically, as soon as B reaches over the line, it should be a technical foul. I argue that at this point, the ball is dead, and the contact, unless flagrant, should be ignored. Others seemed to disagree. Any thoughts?