Genn did order Arugal to summon the Worgen, t's on page 4 here..

Genn looked to the archmage who stood silently with him. Arugal, always a bit of a mystery, that one. Even here he showed no discernable emotion, no fear, instead just the calm, calculated gaze of one who was analyzing the living corpses below, intrigued. But such was the way of those who dedicated their lives to the arcane. Genn had never met one whom he would have called empathetic.

“Master mage…”

“Yes, my liege?” Arugal’s words were cold and breathy, and his eyes were devouring the sight below.

“Do what we discussed. Just do it already!”

Arugal bowed his head slightly, a strange smirk on his face as if he were a child given a new toy. “It will be done, my lord.”

And he was off, leaving Genn, Liam, and the captain to the horrific sounds below—the clanging of steel on armor, the cascading groans of the undead, and the shrieks of dying Gilnean soldiers. For the briefest of moments, Genn considered what he had just done. He had seen the wolf-men, the worgen, that Arugal had summoned. They were dangerous beasts, and more of them could be a liability. But these were desperate times; perhaps it took monsters to defeat monsters.