Mithrax seems eager to get back to work dispelling the Endless Night and put the recent attack on his people behind him.
"Cruel words and thoughtless deeds will not break us," he says. "We will not be led to violence, no matter how wide the path."
He tells you not to worry about him and his people, but to focus your attentions on continuing your Splicer training, improving your Gauntlet, and collapsing the Vex networks.