Nasiah summoned forth the howling icy winds that manifested around him. He actually had no true control over it, or rather, he did not make it.
However, thanks to the Storybook, he knew exactly what it was: The manifestation of a counterattack via the Story.
It was made specifically to counter the Jinn, and with it, he shall. He knew that it was also due to the work of Jon in some way, as in the description of the cold winds, he read out.
"Produced by Jon's dream mixing with Nasiah's."
He knew that Jon's gift here was to be able to enter dreams, so in some way he must awakened further to now control dreams. This was a blessing, and he was ever so thankful for his cousin's ability.
And indeed, it was Jon's help that was currently aiding him as of the moment, as the young boy moved on to grant his power to Nasiah after Phanuel was currently pummeling her adversary.
"The Sages had no responsibility aiding those that desired to destroy us!"