He threw out his hands to guide and steady his going. By and by he walked steadier, now steadier. The mist lifted and the trees stepped back a bit as if to make the way easier for a certain kind of man. Then he ran. Lickety-split. Lickety-split. Looking neither to the left nor to the right. Lickety-split. Lickety-split. Lickety-lickety-lickety-split (C.120).
This ending is going to sound super-weird to a lot of people, especially when it starts talking about how Son runs "lickety-split." There's a lot going on here, and we're going to take it point by point to make sure we get everything covered.
For starters, we know that Son has been left on the shore of Isle des Chevaliers furthest from Valerian Street's house. On his way to the island, Son has been thinking about how he will change everything about himself if he can get Jade back. But changing the way he thinks has put him in a totally unfamiliar headspace, which Morrison symbolizes by having Son grope his way through a thick fog once he reaches Isle des Chevaliers.
When we see Son get to his feet and start to walk faster and faster, we realize that he is starting to find his footing in his quest to change. The final lines about him running "lickety-split" draw a direction connection between Son's situation and the original "tar baby" story of Br'er Rabbit. The adjective "lickety-split" is used to describe Br'er Rabbit running free of the Tar Baby's tarry clutches in this old Southern folktale. Son seems to have finally pulled himself out of a difficult situation, just like Br'er Rabbit was eventually able to free himself from the sticky Tar Baby.
Here's the real question, though: has Son freed himself by embracing Jade's way of thinking, or has he given up his pursuit of Jade and decided to live by his own rules? Previously, Son compared Jade to a "tar baby" that he needs to detach himself from. But perhaps it's Son's rigid ideas that he needs to detach from.
It's unclear what Son has detached himself from, but he has detached himself. At least Son isn't caught between two worlds anymore. He's ready to choose his path, even if the path starts out on the fog of a deserted beach.