Woo! Defeating preconceptions and stuff!

Indeed!

...fiends! Everywhere! Coalescing out of thin air inside the water and in random spots on the bleachers.

"What's happening?"

Theo really should have thought up a better way to harm them! "Please tell me they have a convenient weakness to gold or something."

"They don't," says Kaede, trying to find a suitably flat spot to summon.

A lizard-thing with fire in its mouth the size of a motorcycle appears.

Kimahri roars and jumps at it, landing on it with his huge halberd.

Theo will get his wings back on, transform a couple of seats into something more easily manoeuvrable, and go drop things on the stupid fiends!

Ugh this is not being as helpful as he could why has he not brainstormed combat applications of his power before.

(He tries changing the actual fiends into air too, bits of them, in case they're somehow different from the previous plant.)

Nope. They're all magic.

Lulu freezes the air around the lizard fiend, and lots of lights—pyreflies—escape it, but it seems to still be kickin'.

– He can change the temperature of an area slightly quite rapidly, if that would help, but he's guessing not and expects it won't do much if he tries?

Actually helps quite a bit! The fiend dies.

"You can—of course you can. I'll tell you about elemental weaknesses, your magic is probably better than mine."

(Panic. Chaos. People running from lots of fiends. Tidus and Wakka fighting through legged-fish ones.)

"I can do large area low effect or the opposite, hot or cold – what should I do to what?"

"I'll show you. Follow me."

She starts leading the way to the same direction Wakka and Tidus in the sphere are fighting towards.

Kaede ughs and starts dancing and twirling on the way, and soon—

—Valefor shows up.

Dancing for magic. Sounds like fun.

Theo follows, keeping pace easily and trying to help out with what he can on the way.

Lulu will point out fiends that can be usefully cold'd or heat'd away—can he make water? Some fiends are weak to water. What about thunder?

He can do water, in low quantities unless he's converting something non-air! Thunder – that's a no by itself, directly, and he doesn't know how he'd get it through some indirect method.

Okay so what if he turns a bench's bolts into air and then Kimahri throws it at fiends, can he turn that into water? How about fire? Can he turn it into water then freeze it?

Bench bolts works fine and then he can convert it into water – it's not instantaneous but with just a bench it's relatively fast – and the fire is slightly awkward to do because it's flickering and moving but he can in fact do it!

Then they will successfully fight their way through the fiends and meet up with Tidus, Wakka, and—

—some guy in a red overcoat.

Theo has no idea who this is! Theo continues taking down fiends as described or alternatively guessing if his instructors happen to get busy.

The guy in an overcoat also has a huge sword! It's about as tall as he is.

"Who—" he starts but then the sky darkens.

"Theo, magical person," he comments.

What's up with the sky?

The blackness is apparently spreading from above Maester Seymour's head. A cloud of red-yellow-black light appears there, then, and a chain as thick as a persons torso with a three-pronged hook bigger than a horse attached to its end falls from it and sinks into the ground, turning it as black as the sky.

The chain goes taut, and then starts pulling something from the ground. That something seems to be a ten-metre-tall, ugly, chained monster, the hook wrapped under its chin. Once its whole torso is exposed, it gets free of the hook, which finishes being pulled back into the no-longer-black sky.