Board Thread:Episode Discussion/@comment-30530552-20171121182355/@comment-24994749-20171121235620

SpiritedDreaming wrote: Vernal was holding Weiss's weapon at the time, which had Lightning Dust in it. They could easily attribute it to her using Weiss's Dust against them. It isn't Yang/Weiss that need to realise Vernal is the Spring Maiden, Qrow has to. And Qrow already knows.

So all that needs to happen is either of them name dropping her.