He smirks, "So Hunter, you're on kind of the right lines but pouring water isn't a viable long term solution - Mila, however, very good! Now, we use a freezing spell to target those fires, so I'll demonstrate, and then you guys can give it a whirl." He waves his wand and the tables sort-of transfigure into target dummies. "Now, the key to a freezing charm is just a simple point at your target, and then the incantation- Glacius!" He says, a blue light emanating from his wand to the dummy, covering it in ice. He turns to face the group. "Right then, give it a whirl! Get those dummies frozen!"
OOC: I will GM.