Unreported sub or illegal sub

[Skahtboi]

Originally Posted by umpire12

of course i would certainly not accept an illegal change however the point i am trying to make is as much as i believe in preventive umpiring , i think that giving assistance and advice to either side at some point becomes unfair. its a matter of what level of assistance you are comfortable with as an individual......do you agree with that?

So...now I am really curious. How would you "not accept" the illegal change but not let the coach know???

If you don't accept the change, you say something along the lines of "coach, that can't be done."