Jessop could smell the alcohol on Davis as soon as he neared the window. He asked the man how much he'd had to drink that night.
"Plenty," came the reply.
Jessop said the face that stared out the window that night was hard to describe.
"It was argumentative ... very sure of himself, almost cocky."
Jessop asked him what he meant by plenty. A split second later the officer was staring down the barrel of Davis' .41 Magnum Smith & Wesson pistol.
"The end looked bigger than a quarter," Jessop said.
Jessop heard a click.
Davis pulled the trigger and the hammer fell on an empty round.
"My very first thought - after I realized it was a revolver - was I was terrified. Absolutely terrified," Jessop testified. "I recall thinking I wasn't going to see my wife again. I wasn't going to see my mom, my brothers or my sisters, or my co-workers or my dogs. I was terrified."
Jessop moved his face away from the threat as fast as he could.
"I did hear the click," he said. "I remember stopping. I was actually hoping it was just a joke ... I remember thinking why would you do that to an officer."
And then he saw Davis' head readjust.
"I remember thinking the reason he's readjusting his head is he's going to shoot again," Jessop said.
He ran toward the back of Davis' vehicle, while drawing his Glock 22.
He heard a gunshot.
"My next thought was I had to defend myself and eliminate the threat to me," Jessop said. "I don't recall drawing my weapon. I do remember my first shot. I was conscious that I was shooting my gun."
Jessop thought he'd fired seven or eight rounds. It turned out he'd fired 14.
Six bullets hit Davis' vehicle, including the one that drove through the passenger and driver's seats and into Davis' back.
After Davis' vehicle struck a building and came to a stop, Jessop loaded his rifle and got in his car and moved closer.
Ravalli County Attorney George Corn asked him why - after he'd nearly been killed - did he move closer to his assailant.
"My duty as an officer is to make sure the community is safe," Jessop said. "I had no idea if I hit him or not. My thought was to get close enough to keep the area safe and keep myself safe."
Davis was dead when he was pulled from his vehicle by officers not long afterward.