The last chance to make a wish had to be taken with great care.
Once used up, the Evil Spirit inside the Joker Card would erupt.
Although they had "never met face to face".
But presumably, the Evil Spirit inside had longed for Du Wei, even though it was always the Black Shadow that made the wishes, but it truly suffered too much because of Du Wei.
The original number of wishes had already been used up.
Yet, Du Wei forcefully played a hand by strengthening the Black Shadow, making it take the fall, forcibly pushing back the Evil Spirit, and unreasonably creating six more chances to wish.
In a sense,
Du Wei's methods of dealing with the Evil Spirit were so brutal that they were appalling; he was simply the coldest capitalist. To the Evil Spirits and Evil Spirits in his hands, other than being exploited, when they became useless, they would be recycled as waste.
Take the black umbrella brought from the school earlier for example.
It was directly used as a torch and burned.