Lina notices the whistling on the edge of hearing, under all the ruckus, but what she definitely pays attention to is the unfamiliar tug on her spell -- she can feel that, someone messing with her magic, and it alarms the hell out of her. She's so caught off guard that her fireball goes askew -- whatever influence someone else is trying to exert on it isn't helping, either, and the fireball lands dangerously close to an innocent bystander trying to get out of the way of the action. Whoops.

She whirls around in midair, eyes narrowed. One of the robbers? Nah, they're just a bunch of D-list losers. None of them have that kind of power. No, this has to be someone else...and hey, look who's not running away from the fray. Lina's not stupid, and she's zeroing in on you, kid.

"Hey! What the hell are you doing? Cut it out!"