Two people are in critical condition and two others are seriously injured after a reported grizzly bear attack in Bella Coola on British Columbia’s Central Coast, according to emergency officials.

In a heart-stopping tale of survival, Vince and Garrett Kalkowski, a father-son duo from Cody, Wyoming, narrowly escaped a charging grizzly during a hunting trip near Meeteetse. The younger Kalkowski’s quick thinking and a Glock 20 proved to be the difference between life and death. Here’s how it all unfolded.

The footage is extraordinary in that grizzly bears hibernate during the winter, when the Yukon receives most of its snow. So it’s rare to document a grizzly at close range during a blizzard and before it has shaken off the snow.