How could it be stuck?
The principle is simple:
Just like when Annan obtained "Whispered in the Rain," this mechanism that grants spells randomly will definitely give Annan a spell that he can "immediately equip" and use.
Cold Touch, Lazy Eye, Wall of Stagnation, Frost Nova, Thoughts as Rain, Wheel of Frost—Annan currently only has six spells. Moreover, there's only one slot available, and it's for an "Instant Spell."
If he directly receives the reward, he can only get an Instant Spell from the Idol School.
But the power of Instant Spells clearly cannot satisfy Annan.
Whether it's Cold Touch or Lazy Eye, they essentially belong to the category of "normal attacks."
They consume almost nothing but don't offer much versatility. Their only advantage is being instant and having low consumption.
Moreover, Instant Spells are the easiest to learn.
