I think you got it right.
In the mock-up video, the "A" girl who said : "You guys can fuck me, but please don't hurt my friend." This is the girl that asked to be fucked. The "consent" is loud and clear, and given to ALL guys in the room. So NO rape charge should be preferred against them as far as "A" girl is concerned.
But one or two of the guys didn't keep to their end of the bargain and decided to bring "B" girl to another room to fuck. So "A" girl got dulan.
Now the chink Taiwanese prosecutors and judges must decide on the meaning of the word "hurt". Did the sinkies "hurt" "B" girl ?