Hannah had calculated that she would use 20 minutes to prepare herself in whatever way to defeat the infernal demon, but when Rachira who was already weakened from buffing her with a space technique soon ran out of mana as she healed her and her army began losing, Hannah decided to cut her rest time by more than half, the woman actively rejoining the war in minutes.
Rather than go looking for a fight, since the infernal demon had decided to rest upon his throne, Hannah decided to let him be and instead went to unleash a brutal massacre on his army.
With the Baltimore dead, there was no one in the underworld army who could handle Hannah in any capacity.