As the two disputed Bao's ability to establish a timeline, Judge Nelson interjected, telling the witness to "please stop speaking so Mr. West can ask the next question."
Prepared notes that Bao was reading from also drew West's attention. When asked about them, Bao said, "I typed out potential answers to your potential questions."
Bao objected to sharing his notes, telling the judge that they were private and no one had seen them.
Despite his protests, Nelson allowed the papers to be copied and reviewed by lawyers from both sides.
The notes revealed that Bao had changed his mind about a couple of issues: the amount of time Martin survived after being shot and whether the marijuana in the teenager's system was enough to affect him.
West argued that the prosecution knew about these changes but didn't tell the defense. But Bao insisted that he did not tell anyone that he'd changed his opinion.
The defense attorney pressed Bao, too, on the collection of Martin's clothes and scraping of his fingernails. The medical examiner, though, said he couldn't remember each detail and that he'd trusted that his technicians properly followed procedures.
Late in Friday's court proceedings, O'Mara made his pitch for acquittal -- arguing that Zimmerman acted in self-defense; there was no direct evidence of ill will, hatred or spite surrounding Martin's killing; and that it was still unclear who could be heard screaming on the 911 call.
There is "no other reasonable hypothesis" for what happened, the defense attorney argued, besides self-defense.
The judge, though, denied the motion -- after which, around 5 p.m., the prosecution formally rested its case.