Zhuo An's greatest fear, after being controlled by Fang Mu, was that Fang Mu would use him to harm the entire Beast Controlling Force.
If that were to happen, Zhuo An would have to take considerations!
Even though Zhuo An also feared death, a Guardian Beast good enough to step into the Order, if it did not face any risks, could live for thousands of years, free and easy.
Zhuo An also had his own calculations, but the fear of death or calculations were all within a small range.
When it rose to the entire Beast Taming Tribes, Zhuo An was not afraid of death.
Fang Mu's choice to control him was obviously to achieve a win-win situation between the Infinite Tower and the Beast Controlling Force. This eased Zhuo An's guilt a lot.
Of course! Zhuo An didn't know what Fang Mu's specific purposes and methods were, and Fang Mu would not let Zhuo An know!
Fang Mu gave Zhuo An five drops of Blood Aged Wine to use as a token when coming to find him.
In fact, Fang Mu had his considerations.