"L… Let us back in!"
"Open a path! P… please! Open a p--"
"You attacked first."
"Eek!"
Although Van had been trying to get the Systellion's sun-sized ships to open and do something, he had still been very careful not to go overboard. One of Athena's lessons when faced with an enemy that you know is overwhelmingly stronger than you… is to find a way to negotiate.
To talk.
To talk until they let their guard down… or until they no longer consider you as an enemy.
But as soon as he realized that the Systellions treated other races like one would treat a lowly animal, any thoughts of negotiating completely disappeared in his mind. He had felt this way before back when he was still living in the Relic Graveyard-- people looking at you like you're nothing but a piece of trash.
And for these kinds of people, talking was useless as they think of themselves as higher beings.