Act 3- The Lake
We follow Arthur through the lake, and a feeling of serenity fills the room. This section is much mellower than the last in terms of ride movement, lots of bobbing slowly up and down, not much in terms of jarring motions, til the end at least.
"Oh boy, look, an old junk yard... This must be where they used to throw their old junk."
We see lots of items, swords, jousting equipment, maybe a few hidden items from other movies, perhaps a clock that looks surprisingly like cogsworth or a bed missing one of it's bedknobs.
This would be a shorter, palette cleansing scene, before the big action sequence.
"Oh look, there's some cheese over there, well, you heard what Merlin said about the food chain, I've gotta eat don't I?"
Arthur swims over and tries to bit the cheese, which vanishes. We see a net slowly rise around us until, it's too late, we are caught.
"Oh no, someone's got us." We are dragged upwards, with Arthur, out of the water, until we are face to face with...
"Madame MIM!" Arthur yells, clearly frightened.
"That's right deary, looks like I've caught myself a really fine supper for this evening. You all look delicious!"
"Let my friends go Mim! I promised I'd keep them safe."
"Oh they'll be safe all right, safe and sound within my belly!"
"Not if I can hep it" Merlin yells, as a frog, hopping out of the water, "Mim, let them go."
"No, I'm hungry, besides... you don't frighten me old man..." Mim starts to transform into a large snake. Dropping the net and freeing us, but leaving Arthur flapping around on the ground.
"Take to the skies boy, get your friends home safely!"
Wingity Dingity Birdio Flightus! Arthur is now a bird and we take off through the forest.