Raw Willpower: Starts to transcend both 相手 & himself
Illogical: Humans are illogical—so's his willpower
Too Heavy...?: His hand limps but he wills his sword up
Too Painful...?: His heart stops, so he punches it alive
Nothing Too Much: Ultimately, he wills through everything
相手 isn't the strongest foe he's fought before, & so he just needs to persevere
Trudging there, he adapts even to his countless injuries' rythm, perfecting a footwork designed to minimize his already extreme fatigue
So he strikes & gets struck back, yet miraculously he continues on—相手's attacks should kill him, yet he perseveres, raw determination fueling his body to transcend both himself & 相手