Hanging my cloak on my shoulders but not putting my arms through the sleeves, I walked out of the hotel room, the bottom of my cloak hovering right above the floor.
My main goal was not to allow Liam to defeat the djinns, as in the book; rather, it was to allow the djinns to take hostages.
Enraged by the djinns' actions against his fellow classmates, Liam unlocks a new ability and uses it to defeat the djinns. This ability is used throughout the book, so Liam's not receiving it would pose a massive threat to my attempts to maintain the plot.
By analyzing Lily's past interferences in the book, it was clear that she wanted to protect and ensure the safety of innocent bystanders. So, I was almost certain that she would make a play here to prevent hostages from being taken, inadvertently stopping Liam from unlocking his new ability.
But... what was the play?
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