Well, more or less... As long as it is not unbendable - and nothing set in the future is - then Nkaa Raakan [b]oneself[/b] does not deal with it. It is because of that why the One as the Weighter is essentially using another mind (or, well, two actually, but this would get even more complicated to explain) to determine how the physical form will act. 
Uhh... And how exactly does Nilick's mind and predicting work? I kind of assumed that she would draw the information up and do the probabilities when asked, not calculate in advance... And how would it all with interact with her slumber? 
(Meanwhile, I'll try to come up with an eloquent explanation as to how the management of information with Koraakan actually works - as I woke up around four in the morning, I am pretty much feeling like going back to sleep right now. In any case, the sheer vastness of the amount of information in the world makes the handling of it - as it would reach mortals - that much more complicated.)

As for the tail-spikes, then the damage done to those within the time-frame those have been subjected to the flames can be considered insignificant.