Ares was running across Goliath's streets and fighting several monsters as the fight of the Retaliation Troop was ongoing. He could notice that his superiors were the ones fighting against the Ancients, he knew how to differentiate their Mana from others'. He saw them using Mystical Arts several times before.
'Besides that, nobody in this fortress seemed as strong as they are. I saw them going all out before or, at least, using a huge part of their power. I never saw somebody with such proficiency in controlling and shaping Mana before.'
However, the redheaded boy was not worried about them at all. At least, not at that moment. Melissa allowed him to participate in that fight for a reason, and that was to find Daisy and Rebecca and give them support.