Splits happen when a candle forms a deep fissure from the top down. This sign indicates that the spell is going to force the target to choose between two things.
There are three parts to understanding a split. It's location tell what kind of choice will be made. The direction it flows shows if the target will comply with the spell (clockwise) or resist and rebel (counterclockwise). Any shape that the flow forms shows what the results of that choice will be and how it will affect the results.
What To Do:
Interpret the split and then decide if it shows progress or overall resistance to the spell.
If it shows resistance, blockbuster work or domination work may be helpful to specifically make the target comply by making the choice you want them to make.
It it shows progress, interpret it as normal for the location, direction, and shape.