Illegal Pitch Mechanics-ASA

[miznj]

If an illegal pitch is a delayed dead ball why does p.221 of the rule book state "Do not call time until the pitch has reached the plate or the play on a batted ball has been completed." Sit: R2 caught stealing 3rd on IP. It was a very close play for what would have been the 3rd out of the inning late in a tie game. Off coach started barking as soon as I made the out call and while I was in the process of making the award. Def coach thinking I was intimidated into changing my call came out in a manner that resulted in him being sent to the showers. I did extend my arm and verbal "illegal pitch" at the time of the infraction. My partner referred to the above text an insisted that an IP is dead as soon as it is not hit. He said that the whole mess should have been avoided. I disagree. So which is it?

Thanks!