So we have Ubiquinol attaches onto complex three. And when it attaches, the two protons, two H plus ions are basically pumped. They're transported to the intermembrane space of the mitochondria, and those two electrons follow two different pathways. Remember, we not only have two H plus ions attached to our Ubiquinol, we also have two electrons. These two H plus ions are pumped to this side, but the two electrons follow two different pathways. One of those electrons follows this pathway.