sniper bullet spins round a clips shooter in his earmuff

YouTube

may people watch this video and see if you can explain to me how a sniper .50 caliber round could be fired yet with the speed its goin at not go straight forward to the hill which i estimate being no more than 200-400 meters away from the muzzle and end up turning around to go back on itself and clip the earmuff on the shooter

It clearly must have ricocheted off a rock. Not that impressive.

i know its not impressive but he is lucky that it dint hit him in the face