If, after a mandatory has been passed, a subsequent throw crosses the mandatory line on the correct side but in the reverse direction, the mandatory has no longer been passed. The player must still pass the mandatory on the correct side. A line connecting the lies for the hole must pass to the correct sides of all mandatories for the hole.
What does the part in bold mean exactly?
It can't be right the way I read it - because in my world it is absolutely possible for two lies being connected by a straight line going the wrong way around a mandatory, while the throws having passed on the right side.