By the time Terezi finishes talking, it's more than a little apparent that she's gotten Charlie upset. The girl is many things, but good at hiding her emotions is not one of those things - her lips set into a line, her doe eyes going narrow and cold. The ball comes at her hard and fast.

Fortunately for Charlie, something that she IS is good at surviving the unexpected.

She swings the spear like a bat, knocking the ball to one side. She catches the charge from the corner of her eye, but too late to react properly - for now, she simply moves with her momentum, pivoting on one foot and letting the force of her swing spin her around. She ducks down as she spins, moving the weapon down to keep it out of Terezi's hands - and also to try and sweep her legs from under her.