IW or not?

[Coach Bill]

NFHS rules. I'm the assistant this game. We get an offensive rebound and I yell for them to "bring it out", to reset. Ref had his back to us, blew his whistle, and , seemed to know his mistake right away. Because he goes, "did you say 'timeout'"? Anyway, he grants us a timeout, and insists on us taking it. I try to argue for inadvertent whistle to no avail. I try to point out that I'm not even the head coach.

I know we talked about this recently, but I can't remember the situation where you have to make them take the timeout. I didn't think this was it.