@Red-Supernova  
So is a stone that effects all magic but changeling magic.

@Meanlucario  
Ok, that is too specific to ever exist.

Sandbar: You know you can transform into a seapony ocellus.  
Ocellus: laughs nervously Oh, yeah I forgot.

There’s an anti-changling stone nearby that prevents them from transforming, like the anti-magic throne in To Where and Back Again.

She’s just acting.

She’s a float buggo

@sonicfan  
“I’m worried that Twilight will come along and see what we’re doing!”

Didn’t you transform into a seapony before?

The holes in their limbs leak water.

Pssst, you’re a changeling, remember? Just change into a fish.

Book’s natural enemy is water.
 
Bookbug’s natural enemy is water.

Martian Manhunter’s weakness was fire, and Ocellus’s is water.

Not a problem. Just swim figuratively.

Smolder: You seem to be holding up just fine.  
Gallus: Plus, none of us can walk on water, so I don’t know why you’re so worried.

Give her some floaties and she’ll be over the moon. Literally.

Jesus, bug…

Feel the (surface) tension

She’s such a lightweight

I could make a comment about Non-Compete Clause but I’m not going to.

Just transform into a aquatic creature you have done it before.

Pool buggo is buoyant.

this is actually awesome

amateur, i can swim like fish in a hovercraft

then stop being a bug!! xD