For context:

In my AU, after Grön died in a Golden FrankBurt suit, his soul was shatered & turned into 2 separate entities: "Shadow Lockjaw"—manifestation of Grön's grieve & agony, being a reasonable & human side of him, that died out long time ago, & now feels regret about everything that happens now, & "Golden Lockjaw"—his feral & monstrous side, being a creature of a pure hatred, insanity & bloodlust, still possessing the suit & wanting to murder as many people as he can.

And after this feral side have seen his "old pal" Vincent being completely broken, with everyone he once loved & cared about either dying or just leaving him all alone, it found a great opportunity to use Vincent's tired & sick mind to finally fullfill his bloodlust. He messed & manipulated Vincent, literally torturing him, just to turn him into a perfect puppet.....a puppet that will do ANYTHING he will wish, including him murdering innocent children.....& even murdering the ones they both considered as "family"