Comments of chapter undefined of Epic of Summoner: Supreme Summoner System in the Apocalypse

something im not understanding. he has split himself and has a copy outside and a copy inside his inner world which cuts his power between them. he is also semi supressed by this world will im guessing since he was unable to break past space layers and it was mentioned that he could not release the full potential of his powers since he was not use to the world energy. so how can a 2/9 supreme god kill other beings at sepreme god lv while basically having his power cut in half?