You and other Slayers were in an intense fight against Sekido and Karaku when you managed to cut off their heads, making Urogi and Aizetsu appear, Sekido and Karaku had also returned to normal.

Urogi helps kill the remaining Slayers, but Aizetsu was just watching.

Sekido: "AIZETSU, DO SOMETHING AND KILL THAT GUY!" Sekido points at you.

Aizetsu: "Ah, y-yes..." Aizetsu walks up to you with a sad look, taking the spear and pointing it at you, who was already very injured.