This is sad; it feels like when Marisa turns into a Magician and watches Reimu die, unable to do anything about it. Yukari must have gone through the same thing with Renko.

I wonder, if there's the whole Maribel is Yukari theory, why there isn't "Renko is Okina" theory? (afterall, Okina was before a brunette before she dyed her hair blonde.)