Relief flooded through Sisse as the water froze before hitting Calla. But it would be a lie to say that Professor D'Orsay's instructions to swap rules filled her with a bit of trepidation. Steeling herself she determined she'd just have to block the water before it got to her no matter what. With a small but what she hoped was encouraging smile at Calla she prepared herself and cast "Glacius." with as much determination as she could possibly muster.