Continuity error:
The rifle was bolt action. No round would eject unless the shooter cycled the bolt. The sound the casing made was too soon, as if fired from a semi-automatic weapon. This alleged sniper character would never allow the casing to touch the ground. The two-finger grab is standard upon cycling bolt to eject round. The flag used for calculating wind speed and direction is an incorrect size and type as well. The term, "minute of arc", is incorrect as well. It is, "minute(s) of angle", or MOA.
This is still an entertaining episode.