Board Thread:Speculation House/@comment-14138255-20140815002519/@comment-25308133-20140818153056

Flashfire212 wrote: Remember that the Faunus have heightened senses - we know they have good night vision. What if they can detect pheromones that humans can't? Boom, you can get identified by another faunus without a human ever knowing the truth. The enhanced sense of smell was my initial thought, as included in the post that started this particular discussion, butMetallicArcher has some good points as well, it may be body language and other cues that humans don't usually pick up on but other faunus do. Though Sun didn't really have enough time to observe her to use body language to identify her. After all, all she was doing was just standing there. So smell is tentatively my best guess for how Sun figured it out. With body language and other such cues being how Ozpin figured it out. *shrug* All speculation at this point. With Velvet to become a more prominant character, hopefully we'll get some interaction between her and Blake and that will provide some clarification.