Unrelated story but breathing/mindgames.
We play comp pool and this Greek fella from the opposing team bent over hands on knees and looked through the black ball right up my que stick into my eyes as I was going for the last shot!
I got it in after drawing attention to him and while the others all looked up the hall to what the prick was doing ,I potted it.
Later when he was shooting I asked him if he breathed in or breathed out when he makes contact and he missed .