CENTENNIAL — Prosecutors presented video of terrified moviegoers, laid out where police recovered bodies and explained in precise detail how each of the 12 slain victims died during a grim first day of theater-shooting suspect James Holmes’ preliminary hearing.

Testimony on Monday painted a picture of pandemonium, where blood-drenched people screamed for help and police officers raced against time to save survivors.

While police choked up on the stand recounting the day, the accused sat bushy-bearded at the defense table showing no emotion.

Coroners testified that 33 rounds — a mix of single bullets and shotgun blasts — were used to kill the 12 slain victims. Four struck 6-year-old Veronica Moser-Sullivan.

In signs of an anticipated insanity defense, prosecutors and the defense fought to frame Holmes’ state of mind during and immediately after the July 20 shooting, pitting images of a determined shooter against someone disconnected from his surroundings.

Surveillance video from the lobby of the Century Aurora 16 theater shows Holmes hiding his dyed-red hair beneath a dark stocking cap. He had purchased his ticket for the midnight showing July 8.

Police recovered 209 live AR-15 rounds and 15 live 40-caliber handgun rounds from the scene, testified Detective Matthew Ingui.

The gunman was “very calm and moving with purpose,” one victim told Ingui.

Officers from all points rushed to the scene, at first mistaking the man in the gas mask and body armor for one of their own.

From atop an elevated garage, Sgt. Gerald Jonsgaard scouted the back of the theater, where he spotted Holmes.

“My first thought was, ‘How did that SWAT guy get here so quick?’ ” Jonsgaard testified.

For a few brief moments, he held Holmes in his cross hairs. At the same time, Officer Jason Oviatt realized he had made a similar mistake.

Holmes was “just standing there,” Oviatt testified. “Not doing anything. Not in any hurry. Not excited.”

Oviatt and the other officers paint a nuanced picture of his state of mind — details attorneys homed in on.

At one point, defense attorney Daniel King pointed out that Oviatt had observed Holmes dripping with sweat. Chief Deputy District Attorney Karen Pearson quickly pointed out that anyone wearing body armor would likely be sweating.

Oviatt’s reports from that day note Holmes “simply stared off into the distance” and “seemed to be out of it and disoriented.”

On the stand, Oviatt said Holmes was “very, very relaxed” and showed no normal emotional responses but understood directions and cooperated. Oviatt testified he saw no signs of drug use, despite noting in reports that Holmes’ pupils were “huge.”

Officer Justin Grizzle remembered asking Holmes if he had a partner in the shooting shortly afterward and receiving an enigmatic response.

“He just looked at me and smiled,” Grizzle said.