From what I gather, Gil’s car catches up to the others, mows through the debris, and detonates rocks in the valley, forcing everyone else to take a detour. But thanks to some highly questionable editing we’re shown events out of order, and in some cases more than once, adding needless confusion to the sequence.
Appare’s car manages to make it through the explosion only to break down; eventually Xialian and Al either catch up to them or backtrack and offer to take turns towing him. Neither want an easy win, which leaving Appare behind would cause.
They end up camping for the night, with Appare proving useless at hunting, fishing, and cooking. Kosame dreams of his mother being murdered protecting him and wakes up screaming. Appare is starting to act more human as he realizes people aren’t engines driven merely by logic and science.
By the time the three drivers make it to Eli, Nevada, Gil has already been their eight hours and is ready to go, but they block him. Hototo wants answers about what happened to his father.
When the crowd starts to stone him, Appare, Xialian, Al, and even Sophia shield him with their bodies. Finally, Gil removes his mask and speaks, revealing he and his big brother were merely impersonating Gil, which means they had nothing to do with Hototo’s dad.