Ultimately, 相手: cannot kill 自分 in any meaningful way
Because 自分:: Represents the hope of the future
Power of Hope: Allows 自分 to perform illogical miracles
Power of Hope:: Ultimately surpasses 相手's power & skill
Power of Hope:: Ultimately allows 自分 to grow past 相手
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自分's the God of Hope, & he stands here now to protect the future—for there is no hope w/o the future
[Cosmic Manifestation: Sword of The Guardian] represents 自分's absolute power, transcending 相手 multiple fold, rendering all their power & abilities ultimately meaningless
Because ultimately, 相手 just has no chance of victory, & defeating 自分's just not feasible in any meaningful capacity.