There is really no comparison between the B and the B-3 when it comes to a complete loss of hydraulics. 1950kgs up to 2250kgs MTOW for a start and 847shp!
If the pilot let the nose start to yaw to the left and was not strong enough in the legs to apply pedal - even though the B-3 has a yaw compensator, he would have lost it. The fact that the eye witness says the helicopter had started to pitch erratically re-enforces this. The helicopter will only yaw if the pilot tries to do a low speed/hover touchdown and applies power. The collective is easier to raise (hydraulics off) - than to lower.
This is why the Flight Manual recomends keeping ETL and making a running landing.
Be careful out there.