Alexander kept pondering about how to participate in the war as he knows what happened in the past.
That day Eleanora was saved because of the reinforcement and then she personally marched towards the capital city of Rua to kill King Mendel personally.
Right after cutting off the neck of King Mendel, Eleanora's emotion which she was suppressing came put and she fainted right there after exploding her own mana which made the building collapse.
Alexander can never forget the scene when the building collapsed with Eleanora still being inside of it and how the emperor carried out the unconscious Eleanora with blood covering her whole body.
Even after killing Mendel by her own hands, she still couldn't overcome the shock she went through when all those knights died voluntarily to save her.
No healing powers or medicine worked on her either. She would often get up from her sleep at late night and yell that she killed them.