[quote=@Mammalia]
<Snipped quote by Legend>

Still! But okay then! Do you have any plans?
-Maddie (Retrieval)- By the way, Nova, just so you know, Crona's awake and about to go on a rampage!
-Ruby- Huh? *flickers to Nova* Wait, what? I have to warn them! *flickers to Ruby* But we're kind of on a mission here. *flickers to Nova* Hmm... Hey... *suddenly, another Ruby appears, but with the eyes of Nova* Well, that's a thing! Okay then, I'm going now! *Nova disappears*
[/quote]
So yeah. To completely explain it, Ruby's power boost caused both she and Nova to gain half control of the mind, and they are now stationary. Because of this, Nova can split off if she needs to.