What is prophecy? It is a prediction of what will happen in the future, right? But, what, one should note is the word 'prediction'.
Prediction is just a conjecture. It might happen and it might not happen. Though the prophecy holds weight and depth in it.
Prophecy is more like a foreseen event that you are destined to arrive.
But, forget all these appeals. Now, there is always a thing called present, today, now, this minute. If it is rightly focused the probability and every event and variability changes. If someone were to already perceive their own future what will they do and that is a power which could almost tackle every minute mistake they'll do.
And a man possessing such ability was the one that stood amidst the pile of corpses, Yes it was none other than Nix. To be accurate it was one of his future versions. around him were his every ally. Even Felishia was dead. That showed there was someone equal or more powerful to a demi-god there.