What does Paul do instead of going to Luis's funeral?

Instead of going to Luis's funeral, Paul goes out into his backyard dressed in just his blue suit. He does not put on a shirt, shoes, or socks. 
In his backyard, he makes his way toward the gray wall. There, he wedges his hands into the space between the wall and the sod. Paul then begins to pull up the sod, revealing a rectangular patch of white sugar sand. The patch is about two feet long and three feet wide.
Paul then scraps off the sand from the upside-down piece of sod. He puts the sand in piles on either side of the rectangular patch. Next, he begins scooping up big handfuls of sand from the patch itself, eventually reaching down into the dirt. Paul knows that this dirt is important; it is the land the tangerine trees grow in, at least, when the land is not covered with a layer of sand and landscaped over.
Paul makes a hole in the dirt, flings his glasses away, and cries his tears into it. He cries for Luis and the loss of the man he never really knew. After a time, Luis stands up, brushes himself off, and retrieves his glasses. He then puts the sand and sod back into place. On the way back into his house, he throws his suit into the garbage. Paul feels that his ritual has been a cathartic one, and he is satisfied that he has properly mourned Luis's death.