Slapping back board

[williebfree]

V1 is called for a PC by my partner. As I move to the Trail to administer the throw-in, I hear a noise (behind me, other end of the court)
Simultaneously the Home Coach jumps to his feet and declares, "Hey! He can't do that!"
Me: "Do what?"
Coach: "#24 (V1) Slapped the backboard!"
Me: "I will check with my partner and confirm what he saw. I honestly did not see it."
Coach: "You gotta keep him off the backboard."

I hustled down to my partner and he claimed there was nothing to see. I hustled back and report to the coach.

"Sorry coach, we must have missed one."

If this action had been observed by my partner I do not believe it is a violation of 10-3-14. Because there was not a shot attempt involved.

Would you issue a "T" for it as an unsporting act, i.e. intimidation?