HS Boys Shot Clock Question

[biz]

I'm confused...Are people saying that if the violation occurred when the shot clock horn sounded (ie there wasn't a shot attempt just before the shot clock expired) and the officials recognized the violation (blew the whistle and patted his/her head) and there was definite knowledge of how much time was on the game clock when the violation occurred that we shouldn't put the 1.5 seconds back on the game clock?

Just looking for clarification.