Since the cue ball and the 6 are frozen...shoot straight thru the frozen balls aiming at about 6 inches to the right of the middle diamond on the far short rail...use right English. The cue ball will go to the far short rail and spin into the 1 ball breaking up the combination.
Well, maybe. I was careful in the description to avoid the word "frozen". I'm not sure, but I think the referee did not declare them to be frozen. If they are frozen, it is a permitted shot. (NOTE: I did not say that it was not a foul.)
This brings up the question if the balls are not frozen: Is it allowed to intentionally play a double hit to scramble the balls? If that is allowed, how about instead in the original situation play any shot that gets the cue ball out into the open, and then while it is still rolling, take your second hit of the current shot and shoot the cue ball a second time -- while it is still rolling, but slowly -- to pocket the nine. Is that kind of double hit allowed in the game?
By "allowed" I mean a part of the game that may be a foul but is not unsportsmanlike conduct.
Clearly, my example above of a prolonged double (second) hit must not be allowed or safety play in the game becomes a farce.
If that double hit is not allowed, which double hits should be?
This question is not so far-fetched. I saw the following in a tournament. The player at the table had an excellent position with all the balls open. Sadly for him, on a warm-up stroke he nudged the cue ball, which would normally give his opponent the whole rack. In an instant he realized his mistake and took a second power stroke smashing the balls all over the table and maybe leaving a harder position. Is this smart play? Should this kind of shot be permitted at all? Let's assume for the purpose of the argument that the cue ball was still in motion when he hit it a second time.