While I agree that using the reaction of the cue ball as an accurate indicator of which ball was hit first... every time I have ever tried to explain that to someone after I judged a shot I have gotten a glassy-eyed 'Huh?' followed closely by pointed look saying 'Whatever nerd' :smile:
Many don't understand. I had to deal with one last week. We were playing call shot 8 ball. My opponent asked if he could use my ball. I said yes thinking he was asking about a carom. Then he called his shot & I said, 'wait a minute, you can't hit my ball first.' He said 'I'm not, I'm going to split them'. I said you still have to hit your bal first'. I explained what the resulting CB path would indicate. He missed the shot as it was nearly impossible without hitting my ball first.
However, explaining before hand, killed any possible disagreement. I suggest that that be done whenever possible, which is not always easy to do as some shoot too quickly, I think on purpose when those situations exsist.