[joeysteele]

Boxers and others do use punchbags to train and vent anger that is true. Jay tonight though was angry and wound up at one individual, Harry.
He felt the need after a fair time to not only shout his head off and throw things all over and in the pool, but to make a threat as to Harry in the diary room,surprisingly ignored by BB and to then have to spend a fair time punching into a pillow/cushion.

All he would likely be thinking was that pillow/cushion was in fact Harry, that is what is vastly different from sportsmen training with punchbags and the inward violent aggression Jay had in him at that time.