Earlier, when Westin transformed into a demonized being, his consciousness was taken over by the special demonic energy.
However, that doesn't mean he didn't know how powerful he became when he was in that form.
So, when he heard Ajax say that Westin could transform into the demonized being without getting his consciousness devoured by the special demonic energy, Westin asked whether he could go and kill high-level demon kings.
'No. Even though you can transform into a demonized being with a thought, you will be not as powerful as before without losing your consciousness.'
Ajax rejected Westin going after the high-level demon kings without any hesitation as he continued, 'However if you want to become powerful at the cost of becoming crazy, I don't mind helping you.'
'Nevermind, I will just take care of the mid-level demon kings and the low-level demon kings.'