Board Thread:FAQs/@comment-35965952-20180623155453/@comment-26018514-20180623221358

Glitchee123z wrote: ChishioKunrin wrote: I think it's possible that the Grimm beetle was inside of Cinder, so Ruby's Silver Eye powers were able to detect the Grimm beetle within Cinder. Either her eyes considered Cinder part Grimm because of the beetle, or the beetle panicked and caused a lot of damage to Cinder while trying to escape from the Silver Eye powers.

It seemed like Cinder still had full use of the Fall Maiden powers, especially considering that massive blast that she sent toward Ozpin.

Yeah, it’s possible that her Grimm beetle thing did something to her blood (or something) that made her vulnerable to the Silver Eyes. I still think it didn't do anything to Cinder, and was purely the Grimm bug, which became an interface to Cinder's maiden powers, that was affected.

The only known effect other than Cinder is that Grimm are turned to stone, it seems unlikely the effect varies much depending on target, especially as Ruby is untrained, more like the Byakugan or Sharingan than their advanced forms.

So what can we infer from that is that the only thing Ruby's eyes did was turn all nearby Grimm to stone, which in Cinder's case was an internal beetle that was likely interfaced with her brain/eyes to enable the "mask" effect.

If you watch the last episode of V3, there are 2 things to note about the SEW activation scene:

1. Cinder freaks out BEFORE Ruby activates them(saying What!?!), this indicates that something internal was happening(like the Grimm beetle fleeing the SEW user).

2. Cinder was not facing Ruby "head on", and in fact most of the scene is shown in the reflection of Ruby's eye.

these are both important to note because if you then look at Cinder's damage in V4 and 5, they match up with what would happen if a hunk of pumice was running through your body to escape what was turning it to stone:

-Facial scarring gets worse from her right side(closest to ruby), to her left.

-Throat is damaged

-Arm that was the farthest point from Ruby has been replaced by a new Grimm arm.

So most likely the Beetle inside her fully petrified either while lodged in the nerve cluster of the upper arm, or shredded the nerves so thoroughly as it passed she had no choice but to replace it(and the bug) and the Geist arm was likely deemed a safer choice because it has less tangible form to petrify outside of the arm itself.