Off-Duty Officer Shoots Himself in Elevator

From WLWT in Cincinnati: 

Surveillance video from the elevator shows Jouett removing his gun from a holster under his coat with his right hand, then appearing to attempt to put it back, while holding a box and a bag in his left hand. 

"He was transitioning the holster and transitioning the gun out of his holster. He was going to carry it in his hand as they walked to the car. As he was pulling the gun from the holster, a round discharged, ricocheted in the elevator, struck him in the stomach," Cincinnati Capt. Michael John said. 

The video shows Jouett fall to the floor as his wife calls for help. Jouett gets out of the elevator when the doors open and sits down again. Jouett's wife was not hurt. 

Police said Jouett is a 25-year veteran with the department.

Transition: "the process or a period of changing from one state or condition to another." So by "transition," the Captain meant that Jouett was changing the firearm from a safe state to an unsafe state. My question is: why did he draw the firearm in the first place and why did he have his finger on the trigger?