At the Water Treatment Center he asks you to fight him to make team meteor think he failed his mission rather than betraying him. If you fight him, you have no choice but to win, Solaris, later says this, "his incompetence will be shortly remedied." If you choose not to, Taka gets irritated and leaves. Solaris then says later, "His disloyalty will be shortly remedied." Which did you pick? Because of the risk of cold hearted Solaris killing Taka, I chose to fight him.