The boost of agility provided by that leg armor was no joke as even though Leon wasn't using his top speed at the moment while racing up the mountain, he was still running faster than he had ever been.
However, Leon wasn't the only one that had received an upgrade because Mako could still catch up to him by using a combination of his own agility and his Dash skill.
Mako was closely followed by Erin who had eyes glowing white again, but this time they were quite faint as compared to other times since nobody including Erin even noticed the fact that her eyes were glowing, so it didn't even matter.
In reality, Erin had subconsciously activated her mutant ice gene again while feeling the excitement of competing amongst friends in a friendly race but since she had also recently activated it during her fight against Haruto, she hasn't recovered at all and that was why her eyes were dimmer than before; it was because she was running on fumes at this point.