I was just told that if the CB and an OB are frozen, those balls are considered one in the same and a different OB must be hit besides the frozen one (and then of course any ball hit a rail) for it to be a legal shot. I have never heard this before but the guy insisted its the rule. I asked what happens if the final ball is glued to the cue ball and he said you'd have to kick at it to be a legal hit.