Li Yifei soon learned of the way Aliza intended to save someone, a method that made him slightly uneasy, yet he did not intervene. This was Aliza's own decision, his own redemption. Of course, if Aliza had any evil intentions, Li Yifei would have acted without hesitation.
Aliza's way of saving a life was... to transfer all of his own skills and abilities to Bunong, thereby reviving him. It seemed there was no other solution. Once Aliza started, Li Yifei immediately deduced this, which was fine because Li Yifei's goal was to save Bunong. As for Aliza, the situation was of his own making, and it was only fair for him to save himself.
