User blog comment:Darkcloud1111/Good Idea, Bad Idea~Extracurricular/@comment-4403232-20140830002703

Regarding Pyrrha not hiding her semblance in the fight, aside from Sun and Neptune, the only people left in the room were RWBY and JNPR. I assume she'd tell her own team her ability, and RWBY trusts JNPR with the secret about Blake being a Faunus, so JNPR probably trusts RWBY with her ability (which Ruby and Weiss saw already anyways).