User blog comment:Zathronas/Analysis by an author: Volume 2 episode 6: Burning the Candle/@comment-25091485-20140905022200/@comment-189.134.232.232-20140905213121

If you are suggesting an evil Qrow leaving a clue to a place full of Grimm only to be the hero to gain their love... Nah. Maybe Qrow knew about that place and when he went to their home and found a broken picture frame and two empty beds, he knew exactly what happened and where they were.