According to simulations run on different futures of Ignis and humanity, Revolver says that Lightning's is the only one that leads to mutual destruction.
The moment where humanity's dueling 
surpasses your expectations!
den Augenblick, in dem menschliche
Duellfähigkeiten eure Vorstellung übertreffen!
O momento onde a capacidade de duelo
da humanidade supera suas expectativas!