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.