I got a little film of it as well, it's toward the end of the video [ youtube video ]
We do not have a label for this Limenitis lorquini butterfly. Upperside is black with white median bands on both wings; tip of forewing is orange-brown. Underside is reddish-brown with white markings.
Lorquin's admiral is a butterfly in the Nymphalinae subfamily. The butterfly is named after Pierre Joseph Michel Lorquin, a French naturalist who came to California from France during the Gold Rush, and made important discoveries on the natural history of the terrain.

British Columbia south to southern California and Baja California, and east to Idaho and western Montana. In Montana, reported from all counties in the montane western quarter of the state, primarily west of the Continental Divide