I could see Dahlia just wanting friendship at first, and being hesitant at first, but I know she'll click with Cole right off and Clary, and once she meets Billie, she will click with her too. But Dahl probably won't come in until about a week before the survival test.

Billie: fine. But no one would miss anyone I want to kill!

Alex: this is why I took away her knife collection.

Cup full of pencils, heavy duty pencil sharpener, stapler... the ammo will get better day by day.