Inside of the manifestation of the paragon body, the girls that weren't participating in this first try, were baffled.
Truth to be told, Aster didn't ask Felicia nor Camila to act earlier, he only explained his idea of using the ying-yang array along with Aria, so it was easier to fight against the Liger, but those two saw the opportunity to help and jumped to action.
Felicia's attribute is darkness which's orientation is yin, so she went to the left arm where Aria is channeling the yin energy that the cores contained.
Earlier she was comfortable in the dark places where yin was abundant, feeling that atmosphere was beneficial for her, so she supposed it will be the same now, and she was right, she could create such a huge vortex and maintain it constantly with the help of the environment that was artificially created in the left arm of the armor.