User blog comment:Megadracosaurus/Why Cinder is affected by the SEW's/@comment-5717877-20181222190200/@comment-4010415-20181223001038

1. "or she could already be in the vault"

She hadn't yet entered the vault because Lionheart hadn't unlocked the vault yet. She didn't go down there until Cinder went.

2. "she wasn't close enough"

The light was shown spreading out all around Ruby, filling the room, just like how we have now seen a flashback of Maria lighting up an entire field. We can see in this screenshot here that Raven wasn't that much farther away than Cinder was, and thus, she wasn't too far away to have been affected.

To be honest, we already knew from End of the Beginning that the silver eye powers don't just affect what's within the user's view. We saw what Ruby could see - just Cinder and Pyrrha. The Dragon wasn't within Ruby's field of vision, yet it was turned to stone by her powers because her powers affected the area around her, not just in front of her.

3. "Perhaps Raven didn't come into view, the animators didn't show it"

If Raven was affected by Ruby's silver eyes, then not showing it is completely neglectful storytelling and creates a plot hole because Qrow would have reacted to Raven being affected. He was fighting her, and in the screenshot above, you can see that he was still near her when it happened.

He would've been able to put two and two together and would've realized that Raven was the Spring Maiden. This would've elicited a reaction from him because all that time, he had thought that Raven was hiding the fact that she had the Spring Maiden, only to find out that she has actually become the Spring Maiden and kept it secret from him. This would've left him to wonder what happened to the previous Spring, whether or not Spring's death was Raven's fault, just like how Yang questioned it when she found out.