Sorry for being so late to the party. That flu hit me harder than I expected. The first time I read this chapter I couldn't handle the battle English.
Today I had more luck understanding what was going on. This flashback shows us a lot about the respective characters of Polara and Nor's father. He prefers seeking battle over the survival of his own people. He's lost all common sense and we can expect Nor to act the same way. Polara is fighting because she has to and would prefer to maintain peace, but the circumstances won't let her.
I'm fearing for Clark, what he'll be forced to do and how it will affect him in the long run.