Lily
Lily didn't even wait for her attack to expand before shooting forward herself, despite appearing completely relaxed, she still somehow managed to launch herself forward as if she had been planning to do so all along. The searing lightning bothered her little as dispersed as it was and she showed no visible expression of pain, not that she'd show one even if she was really hurting. But that was far from the end, her hand was still raised and she took full advantage of Coconut's panicked retreat by strategically sending out another one of the expanding balls to detonate in front of the fleeing demon girl.
Magic wasn't all about power, it was equally important to know how to shape it, and how those shapes affected its performance. While she'd never been particularly gifted in terms of her output, she still knew more than the mere basics of elemental manipulation. Compressing her blast into the size of a bullet allowed for maximum speed, while the secondary delayed command to make it expand shortly after being fired was there to catch her opponents off guard. An effective strategy since they'd be expecting a tiny projectile with a lot of penetrative force, but were instead faced with an explosion.
Taking the little demon's inexperience into consideration, she'd most likely listen to her instincts first and foremost, and her instincts should tell her to move in the opposite direction of the explosion, meaning directly into Lily's hands.
"No one's going to wait when they're trying to kill you!" Lily said as she prepared to catch Coconut.