Just hours later the terrorist was killed in a savage gun battle that left at least a dozen fighters dead.
Newly-obtained footage shows the intense fighting that ended in Evans' death last weekend.
He was filmed during a raid on a military base in Lamu County, on Kenya's northern coast.
The dramatic film captures the moment Evans falls to the ground after being hit by a bullet.
It is a shocking tale of peaceful schoolboy from the Home Counties turned crazed killer while with a radical terror group.
The extraordinary pictures of a meeting between like-minded militants were found in a camera strapped to Evans' dead body.
They show the relaxed greeting he gives co-fighters including another white man - German fighter Andreas Martin Muller.
In one clip, a group of several dozen fighters can be seen jumping up and down and gesturing to the sky in an apparent celebration.
The men, dressed in a mixture of camouflage, Western and local outfits, hug each other, shake hands and embrace in an area of cleared shrub land in the north of the country.
Evans is seen proudly wearing a knife strapped to his chest before he puts his hand over the camera and the footage stops.
In another video, a masked militant is pictured fiddling with what appears to be an improvised explosive device.
But the footage soon turns ugly as later filming shows the moment Evans is hit by a fatal bullet, with explosions lighting up the night sky.
His mother, Sally, said her son had met "some people with some very twisted, warped ideas of Islam" and that her "whole world has fallen apart" after the news that he had died.
Al-Shabaab means 'The Youngsters' in Arabic and is affiliated with fellow terror group Al-Qaeda.
The group operated predominantly in Somalia and Yemen but fighting has spread to a handful of countries across sub-Saharan Africa.