Twat page here has slo-mo vid of Kyle on the ground.
https://twitter.com/Lukewearechange/status/1298647269298909184
Looks to me like one of the protesters tried to grab the rifle, but the sling held. Shooting starts after that.
Also, when Kyle gets up and there are no direct assailants, he stops shooting. He didn't shoot the guy with his hands up. IOW, no spray and pray.
I'm just not sure if the shots at the very end are from Kyle or not. Looks like he was under control and visually assessing
If someone did try to get the rifle, different ball game wrt to threat of deadly force, IMO. He was trying to retreat, the protesters weren't.