I’m assuming that no evidence of any threat to the life or safety of the officer or bystanders was found?
The recently released body cam of George Floyd sitting in the driver’s seat and REFUSING MULTIPLE COMMANDS to put BOTH hands on the steering wheel. He put his left hand on the wheel, but kept his right hand down to his side. That’s a sure “tell” to LEOs that the right (hidden) hand is going for or holding a weapon.
Maybe that is what transpired here as well. As others said, not enough info.