"Yes," Lizzy said absently to Tyler's comment. "Because in a few more days, we will have killed them," her lips curled upwards in a devious grin, and she giggled a bit in spite of herself.
She knew that wasn't really how it worked - enough people had explained to her that you couldn't kill dementors that she had finally grasped that concept - but it was fun to imagine.
When Ari giggled at her image, Lizzy looked over and grinned at her a bit wider, feeling a bit better herself. "It's only fair," she pointed out loftily. "They should be given the fair chance to run away terrified, their stupid cloaks waving away behind them. Maybe they'll lose them, they run away so fast."
She giggled again, adding that image to her depiction. Innocently naked stick figured dementors, running away with their cloaks floating to the ground behind them, having fallen off.