With so much money flying around for this commercial, I wonder why they couldn't afford a radio for the flight helper. Waving your arms in the wind while attached to a safety line in the down wash of the main rotor is not how things are done safely. No long line? No bubble window? Take the door off and let a long line specialist get the job quickly and safer. The flying was very smooth but it looks like this company does little or no external slinging in regards to equipting the ground crew with radios, (all three ground crew members). I wonder who did the safety assessment for this job?
Marcus