Board Thread:Speculation House/@comment-69.138.248.186-20170111152805/@comment-28522425-20170329023702

Actually, Qrow was using her as bait. Otherwise, he could have told them about his Semblance and travelled with them, simply keeping some distance like he did during the entire journey. But, he knew that she painted a target on her back and that one of Salem's minions would probably go after her. So he decided to follow them closely, so he could protect Ruby and take the minion for surprise when he came to attack her. He would be protecting Ruby and would take out one of Salem's minions, probably after questioning him. So yeah, regardless of his intentions, Qrow was using her as bait.

Not only that, but Qrow (and most likely Ozpin) intend to use Ruby as a weapon against Salem. He told her about her powers, knowing that she would like to help, and then pointed her in the right direction, without actually telling her to go, all behind Tai's back. Ruby did exactly what he wanted her to do, and he made her think that it was her idea.