Ruby, Weiss, Blake, and May step outside to see the horde of grimm, they begin killing grimm. If not? Then theres the possibility for redemption. The real question is whether or not that leads to her death. So Cinder is clearly being set-up to defect from Salem. It's just a matter of when for all these things. Trust and Loyalty seem to be in question on Ruby, Jaune's and Ironwood's sides as well.
Even Emerald seems to be in the process of turning her back on Cinder by finally breaking free of her own illusions about the person she considers family and finally seeing her for what she really is. Hazel is in the process of being swain by Ozpin to betray Salem and Neo has been set up to betray Cinder since V7. You can probably link it back to the idea of leadership but the theme is pretty clear. The threat of betrayal and people shifting sides is a constant theme being shown in the Salem faction.
They specifically highlighted that Salem is basically the same as the evil step-mother and Cinder doesn't truly serve her. Theres definitely going to be a falling out. Hide Spoilers Blur Spoilers Show Spoilers