He wasn't at all surprised Xinghe openly challenged Chui Ming, but he was shocked that Xinghe knew her way around the computer!
Not only that, she was a hacker!
Mubai found it impossible to accept that the hacker before him and his ex-wife were one and the same.
In Mubai's mind, Xia Xinghe was a woman who didn't know anything so why would she suddenly know how to operate the computer?
Plus, based on her technique, she was very good at it.
Since she dared to declare war against Chui Ming, it meant that she was confident. Even though their X PC Manager was at the brink of being broken through, she still had faith she could take down Chui Corps' security software before then.
Either she was bluffing, which was unlikely, or she was indeed really good at her job.
The drastic transformation, pre- and post-divorce, in Xinghe was hard for Mubai to stomach.
However, he quickly came to terms with reality.