Boots, boots made the difference 😂
Absolutely! Competitive shooters that use the kneeling position have use square toe shoes to stabilize that foot. Thinking they also used sell a cap that could be attached to the shoe.
But seriously, the sling........ Huge lesson there. He got knocked down to the pavement, drop kicked, & hit in the back of the head with an object. I don't think his right hand ever lost grip on the rifle. But if it had, his sling would have kept it in a reasonable position to be easily regripped.