It seems a self sustaining comedy of errors: crewie on the steps guiding the pilot (probably with a 'drop now' instruction) allowing a swing to develop so the pilot follows instructions and fails to damp the swing and so on. Quite why they want 2hr 15min fuel then limit the bucket to 500lt shows further that there's been no input from anyone with Helitak background. Operating a BK117-B2 I'd have 1.5 hours fuel and a 1,000lt bucket, limiting the first pickups to have about 800lt. An hour on task then refuel/relax for 5 minutes.
Another view of the demo
here