Board Thread:Episode Discussion/@comment-14138255-20160328014907/@comment-26397825-20160329003314

Well, there's two prevalent theories floating around at the moment. The most proliferant is that Qrow takes the shape of a crow himself. I am personally not a fan of this one because of the reason you just stated.

The other is that Qrow can 'mind meld' with crows like a druid or ranger can (something like what Bran Stark has been doing occasionally in GoT), and see through both their eyes and his own. This explains why there seems to be a crow everywhere, including during his fight with Winter; he's keeping an eye on things even while he's physically busy with other things.