double hit is a fault. although the replay shows that they were doing synchronized hitting. exactly the same stroke and timing.
Instead of juggling with three balls, the entertainers, a man with a bunch of kids,each perform hitting five shuttles with a racquet in succession continuously.
If I'm not wrong, the same thing happened at the French and Denmark Open where it's translated into the national language.
It happened in France not in Denmark where English was used atleast for post match interviews. But, everyone knows French are linguistic chauvinist.
The prize money for the WD winner is USD27K+, much less than at the CHN Open about USD42K+ if my memory serves me right.