It might be that they're dead. They might be not.
The sole thing that Evlan cared about was to immediately shut them down. Well, that ought to be within expectations. Evlan was the older brother of Ivanov. Their late parents were the epitome of pacifists. From whom would Ivanov learn his ways?
Obviously enough, from Evlan who stood in the place of their parents.
Ivanov was cared for and educated by Evlan, albeit in a rather authoritarian manner. Still, Evlan allowed his younger brother to do whatever he wanted, for the freedom of a child was their greatest teacher.
Moreso than being told, Ivanov adapted his older brother's traits through watching his every fight. The moment that they were captured and traded as slaves, Ivanov turned to Evlan for salvation.
And the defense mechanism that they developed over the aethras of being slaves was to go for the kill before anyone else.