Calliope's ears prick up in distress at the little bat's cries. ".....'mother'? Is that the human?" She tilts her head, moving her ears to try and listen for the sounds of said human.
Amarin keeps his sword drawn, but by his side instead of up-and-ready-to-behead-someone-with. "Whoa, now that's a tiny bat- ack!" Calliope, in one swift movement, tucks Jormungand in a safe pocket of fur behind her neck and launches towards what she assumes to be Petra. Amarin still isn't used to flying on Calliope with his dysfunctional leg, and Calliope frequently forgets this, but he somehow manages to hang on to her as she flies towards the rapid part of the river.

Calliope lets out a sharp gasp, seeing Petra floating in the water.
"Well that certainly doesn'r look too good," Amarin deadpans, putting his sword back in its sheath and looking surpassingly bored.
Calliope smacks him with a wing, shooting him a vicious glare- "What is WRONG with you?"- and picking up Petra as best she can with her hind paws. Slowly, she lowers the girl to the ground and pushes her to lean against a nearby ledge of rock. "Oh dear. Let us hope she is alive."
Amarin dismounts Calliope, limping over to said ledge which he uses to prop himself up. Calliope looks at him expectantly. "What?" He says, raising his arms in emphasis.
"Well? What are you waiting for? YOU'RE the human here, you go figure out how hurt she is!"

Amaris mutters something foul under his breath- one look at Petra tells him she has a low chance of survival. He's no medic, but he can tell there's water in her lungs. "Well?" Calliope sits back on her haunches, blinking at him serenely.
"No. You can't be serious. NO."
"Do it."
(Of course, Calliope wants Amaris to perform CPR.)

(haHAAA)
Amaris swears again, rubbing his temples. "Calliope, I swear if this ever comes up again....." He mutters. "Here goes nothing." He places his hands on Petra's ribcage, pressing a few times as he'd been instructed to do in a medicine class long ago, then breathing into Petra's mouth to expel the water.

"Bat indeed, young one," Calliope says softly.
Amaris silently hobbles back over to her side, translucent skin blushing bright red and a more-aggressive-than-usual scowl on his face.
Calliope waits until Petra is..... um, finished. She notices something slightly different about the girl..... the color of her hair and skin isn't like anything she's seen in the Underland before. Could it be?
"An Overlander....." She whispers. "Amaris, we need to get the human back to Regalia immediately."
He gestures silently to his leg, raising his eyebrows in irritation. Seriously, Calliope? It's been a year and a half.
"....Right." Calliope gently hoists Petra onto her back, making sure she's securely on before lowering a wing for Amaris and gliding, as carefully as possible, back towards the Underland city.