Apparently Aiden has some kind of puppeter creature/monster/person going on in his head. And he said 'weaver' earlier, so that's what I'm calling it. Could be Arachne (http://camphalfblood.wikia.com/wiki/Arachne). Which would be a good reason to send Ryu. Arachne hates the children of Athena and cause them to have arachnophobia (http://camphalfblood.wikia.com/wiki/Arachnophobia (http://camphalfblood.wikia.com/wiki/Arachnophobia)).