We have a doer and a receiver.
I think the doer means something by his action. If in doing this action it is unsportsmanlike, an official is required to give him a T.
I think you mean nothing based on how the receiver reacts to the action or how you would respond. You have a philosophy about this. But is this the philosophy of the rules. If it is no T but if isn't then a T.
On a communicaton level (here it is non-verbal), the act of staring has some meaning. A meaning is imparted. Thus, how could it be nothing. I do not think the coach did what he did cause he wanted to send a "nothing" message. I do not believe in this situation we are in the proverbially "sticks and stones will break my bones, words can't hurt me" situation.
So it is unclear to me what nothing means to you. All I am asking is for you to explain, elucidate how you use the tern nothing in your sentence.
Is the staring unsportsmanlike or not. If it is, a T is needed. If not, not T.
It is that simple.