Please watch linked Video carefully.
Finicum was facing the camera, he had his hands up @ first, then he dropped his hands...and then he had his back to the camera, reached into his left pocket, and then extended his right hand, and you can see the gun against the white of the snow, just for a split-second. Then it appeared that he was trying to **** it, or maybe trying to take the safety off. He was wearing dark colored gloves, so it's hard to make out. (It seems unlikely, but maybe Finicum finally realized that he WAS about to be shot, changed his mind and put the pistol back into his left pocket.)
Also, this article states that OR State Troopers gunned him down.
See this vid, and article. Watch closely @ the close up @ 21 sec. use pause/play button to freeze at the proper time. Also, see the slo-motion portion, esp. @ 49 sec.
FBI releases video footage of LaVoy Finicum shooting | OregonLive.com