Choosing black is death, but so is choosing white. I can't kill the witches either. How can I survive? Zhou Wen thought to himself.
Of course, he could just make no choice. With Truth Listener's Evil Nullification and Heaven-Opening Scripture, he might be able to forcefully break through and kill the black-and-white Destiny Witches.
However, if Zhou Wen were to enter the Maze of Lies with Lance and company in the future, it was best to understand the various abilities of the black-and-white Destiny Witches. If anything happened, he could figure out how to deal with it.
In fact, Zhou Wen's main goal for grinding wasn't to clear the dungeon, but to figure out all the information regarding Sunday's dungeon to prevent any accidents from happening in real life.