During the flight, Du You and his companions deliberately deviated slightly from their route to avoid interfering with the other groups. After all, once the battle started, these guys wouldn't hold back.
Du You positioned himself between the two sisters and the other Death Gods, separating them, then launched attacks on the surrounding Demon Kings.
The two sisters were thus isolated, forming their own special space where they wouldn't have to worry about interference from others. After selecting an opponent, the sisters began to fight.
Of course, the sisters were meticulous in choosing their opponents and didn't simply pick randomly.
Most of the other Death Gods sought opponents with similar strength, but the sisters specifically targeted Demon Kings who were significantly weaker than themselves, only at the early seventh tier, enabling rapid kills.