There is no way you can look at that clip and be positive about what happened. No one mentions that Gorst has a lot of skin in this. When he saw Shane`s indecision, when he saw how close the cue ball was going to be to the object ball, he should have gotten someone to watch the shot. This is something every league player in the country knows.
imo that oversight can be excused as well as the foul, if it was a foul, by the hour of day. yes you can execute the shots until 04:00, that's muscle memory, but this kind of alertness or awareness is surely not at its peak at that time.