I guess he didn't do anything upstairs, he was in that physical condition. When whispering with the blonde girl, he discussed with the girl, went downstairs and performed well, and then paid three times the amount of money to show his strong fighting ability in front of the brothers, nothing more.
In fact, it's easy to guess, judging from the various performances of Alan Jin's old age, it is impossible to have combat effectiveness at all. And if Pacino ate a bottle of Viagra, the golden gun didn't fall. That girl didn't behave like that. Can Allen King convince the two girls in this short amount of time?
But this is also a point worthy of fun and humor in this comedy. You can guess that Alan Jin has the same combat power as his bed skills against the sky, or it is logical to infer that he is just acting in a scene with two girls. The director probably doesn't know the truth.
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