What did the doctor do after he finished treating coyotito?

After the doctor finished treating Coyotito, he expressed his disdain for the lower social class of the indigenous people, feeling that they were unworthy of his care. He also saw an opportunity to exploit Kino's situation for financial gain, as he wanted to charge a hefty fee for the treatment. Ultimately, he returned to his home, revealing his selfish and opportunistic nature.