>>3509368Vergil was still beaten into submission by Mundus, he didn't become Nelo Angelo right away. After that he was Mundus' right hand man for about 10 years before Dante showed up to free him. That's a long time for Mundus power to be taking over Vergil, so once freed its not surprising that Vergil was dying from his corrupted state and only his demon power is what was keeping him alive.
