Here is what the "breaking down your cue" rule is for. If your opponent is "on the hill" and running out and you break down your cue, you are in essence telling him, and everyone else, it's over, I've had enough. Kind of like throwing in the towel in boxing.
When your actualy at the table shooting and you start breaking down your cue, it is, and should be precieved that you are switching equipment, ext........not calling it quits......common sense.
Anyone who calls foul, says you forfit, or loose because there opponent takes apart there cue while they (they meaning the player at the table) are at the table and is there/your turn shooting is a Nit, nitwit, monkey spank, jerkoff. Don't quote rules to me either, having some pride, being human, and not being a petty/ rule pushing worm is something the better players/people pride our selfs on.
If your the kind of player that takes ball in hand after your opponent is down stroking the cueball and a player or person accidently pushes them into the table and hits the cueball, you fall into the no pride, not human, very petty, rule pushing worm, Nit, Nitwit, jerk off catogory.
I had this happen to me once, and guy took ball in hand.
I've had this happen to my opponents on more than one ocassion, and no I never took ball in hand.
Sportsmanship and honor, it's earned, not bought, or stolen