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Showing Seth that his son is now working for him and no longer remembers him might finally break him and convince him he lost, it's over, he has nothing to cling onto anymore so he might as well just give up. And to a certain extent, it's exactly what happened. Seth broke down.
@DxsertBound I went back to check because I didn't remember that line like that, and turns out in tappytoon it says "I didn't become this way because I wanted to" Basically I think he's trying to say to Horus he didn't become a ruthless power-hungry killer because he wanted to -- (1/2)