User blog comment:Raul123alin/My theory about the origin of the titans/@comment-123.243.226.238-20131004102035/@comment-98.155.129.159-20131020045314

Note that the moon is a reflection of the suns light so the ape titan probably just gave them a direction to move in. And the wall titan could only blink, he didn't try to move out of the wall at all.