Lumiel and Isaias went back to the Headquarters but they met raiders along the way. Wanting them to confiscate their belongings and goods.
Lumiel was on his high horse as he felt very agitated about what they've done to Isaias. Lumiel was away while he bathed on the rivers when Isaias was cornered.
He leapt towards them. Landing on the ground, he stomped his feet that made the ground shook.
Setting aside his own life for revenge was what made him do selfish things at that point. To the point of killing the enemies.
If he will ask himself why he will kill those bandits, it was of pure hatred.
These bandits will more or less slaughter them one way or another. Just to make sure that they will not reach the other villagers first, Lumiel confronted them head-on.