Prosecutors did not indicate why Holmes' pupils were dilated.
Oviatt said Holmes seemed "very, very relaxed" and didn't seem to have "normal emotional reactions" to things. "He seemed very detached," he said.
Holmes volunteered that his apartment had been booby trapped, the officers said.
At one point, Grizzle asked Holmes if anyone had been helping him or working with him. "He just looked at me and smiled ... like a smirk," Grizzle recalled.
Officer Aaron Blue said Holmes was fidgeting around after he and Oviatt put him in a patrol car, prompting them to stop and search Holmes again. They were worried they might have missed something because of Holmes' bulky outfit.
Inside the theater, the movie was still playing on the screen. An alarm was going off and moviegoers' cellphones rang unanswered. There was so much blood on the floor, Grizzle said, that he slipped and almost fell down.
Blue went with Jessica Ghawi, who was shot in the head, to the hospital. He said he held the head of the 24-year-old aspiring sportscaster steady in the backseat while someone else drove so she could keep breathing. She later died.
Caleb Medley was also wounded in the head, and Grizzle recalled the 23-year-old aspiring comedian struggling to breathe on the way to the hospital. Every time he thought Medley had stopped breathing, Grizzle said, he yelled at the man not to die. Medley survived, and his wife gave birth to their first baby days after the shooting.
Another man Grizzle took to the hospital kept asking where his 7-year-old daughter was. For about half of the trip, Grizzle said, he had to restrain him from jumping from the patrol car. At one point, the man opened the door and tried.