William was frustrated for a reason. These Wrathers came out like a dam got broken and a flood was released. They didn't give him any chance to wait beside this region and watch what was happening for these clouds to appear here.
He wanted to see how they got formed, so he might find a clue or something about them. But as he had to always retreat, even when he decided to stand his ground and fight using everything he got, but ended up getting pushed back, he decided to leave such a task over to the more formidable masters.
He spread the word, and everyone got what he wanted to do and the value of this task. After one day, the two teams already got formed, while the other half of masters left to stop the Wrathers coming from outside were asked to evacuate in ten more hours.
The masters evaded all the areas flagged by William. And luckily, they didn't meet anything out of norm so far.