[quote=@Prince of Seraphs]
Something just occurred to me. Qrow came to Beacon to swap intel with Ozpin and watch the Vytel festival. I don't know about the previous rounds but at the very least he should have been watching the round that his niece was involved in Yang Vs Mercury. So why didn't he recognize Mercury, they fought during that stuff with the Fall Maiden and even Mercury was worried that Qrow would recognize him when he saw Qrow fighting Winter. Why didn't Qrow raise the alarm.
[/quote]

If you look back at episode 7, you can see someone using some sort of face-disguising blur after Qrow appears.  I'm guessing their faces were obscured.  Not a particularly good excuse, since show logic dictates everyone only ever has one outfit, but whatever.