It seems that many here do wonder why the person in the video is not seated in the helcopter during start and eager to pass judgement on that person.
It is not at all unusual to have a instructor montoring and demonstrating start procedure to students (seated inside) while standing outside on the left skid.
However in this instance my guess is that the person starting the helicopter is a A&P mechanic starting the helicopter and wanting to be outside to monitor either for leaks or unusual noise.