The guy did look well trained as the SA-18 is a little more tricky than others. His drills were good, particularly with battery management and he had a very good stance. It is very easy to end up eating the grass in front of you when the launcher leaps forward after firing.
Reasonably small FoV on an SA18/24 so no problem with clutter in that engagement.
Seeing any aircraft go down makes me shudder.