While the path of the cue ball does tell the story for this shot, it is not one of the simpler situations, like shooting between two frozen balls. I can see how the ref could be unsure about what a shot would look like if close to a simultaneous hit.
A path of the cueball & The reaction of a cueball, one of the two can tell the whole story, I am sorry....it can 100% tell the whole story.
A simultaneous hit is a rare, very rare actually....let me say it again vvvvvvvvery rare, and if that happens I also can tell you that it might of happened based purely on cueball reaction and what the balls did after the shot, 100% I can tell you purely from the movement of the balls as a whole. But considering our rules in pool if that ever happen, and thats a big if here....lets say it happened where the cueball striked two balls simultaneously in the same second, then its a good hit and you cant foul anyone for that one.
But I can tell you, i always can figure out a good hit or a bad hit based on cueball reaction, and this isnt just from shooting into balls but I can also tell you from rails backhit prespective, I know what the cueball should do and what it shouldnt do, rail-first hits, rail-second hits....all that you can tell from the reaction of the balls, or the paths of them balls.
I saw a bustamante/daryl video clip above and I cannot believe how many times they kept running a slo-mo. I swear to god man there's absolutely noway to 100% determine a foul in pool by seeing the balls or squinting into the balls or even running slow-mo's, whoever keep checking videos to determine bad hits by running videos at 0.1 sec and frame by frame to see which ball was hit first, sir you're doing it wrong....100% wrong. The worst thing these guys did was going through the slow-mo over and over and over to see if its good hit or bad hit...all you need is the full-speed and watch the reaction of everything, I kept looking for a video of the whole thing but didn't find it...
Give me this Busty/Daryl video a full-speed of the actual shot, no slow-mo's and ill tell you if its a foul or not.