User blog comment:HalointheSkye/Volume 3 Chapter 9 Teaser - This is bad.../@comment-24994749-20160114002253/@comment-226878-20160115061404

When a virus is uploaded to a device, it can include the ability yo remote access that device even when it's turned off. Cinder could have been eavesdropping on the Maiden convo both in Ozpin's office (likely via his desk) and in the chamber (via Ironwood's scroll).