Old Mr. Johnson's disease was caused by pathogenic factors. Nathan explained briefly to Carlos, then looked at a string of beads that was worn on Old Mr. Johnson's wrist. He got it off from him.
"These beads are made of human skulls, but you regard them as Buddhist beads. It has a strong pathogen spirit in itself. But you wear it every day, which leads to this situation." Nathan said, throwing the string of beads aside.
Carlos asked, "How do you judge it?"
"It's simple," Nathan said.
While explaining, he manipulated the back of Old Mr. Johnson. It took only ten minutes for Old Mr. Johnson to spit out black blood, then he also woke up.
The onlookers marveled at Nathan's medical skill.
The Johnson's felt awkward and all kept silent. When Old Mr. Johnson woke up, they thanked Nathan and left.
Only Natalie stayed.