No Sienna in this one, sorry.
You see, something they were to supposed to learn in Port's class later on was this: every type of Grimm feared one type of animal.
For Deathstalkers, they were scared of penguins.
And Jaune's semblance just happened to be morphing into a penguin.
The second he transformed, the Deathstalker stopped and promptly 'fuck this shit'-ed out of there, with Jaune chased after him, arms stretched out and barking out penguin noises as he charged the monster.
Eventually, the Deathstalker cornered itself on top of a tree like a scared cat, wrapping it's tail around the trunk as it was hissing and snapping it's claws at Jaune, who was still barking penguin noises as he circled the tree.
Eventually the trunk snapped and the Deathstalker fell down in front of Jaune.
Jaune barked a penguin noise and the Deathstalker got up and ran away as fast as it could.
It screeched to a halt when it found itself at the edge of a steep cliff. The Deathstalker considered it's options.
In front of him was a cliff that would kill him if he jumped.
He turned around and saw the demonic bird running towards him as fast as... how ever slowly penguins run.
Shaking in fear, it made a decision. He jumped off.
When Jaune reached the cliff two minutes later, he looked down and started making victory penguin noises.
Jaune then turned back into a human and did a little victory conga dance.
RWBYPR could only stare dumbfounded at the site, while Nora's eyes sparkled with glee as she finally found something worthy of being her war pet.
Prompt that was given: Jaune transforms when saving ruby from the deathstalker
Comment typed immediately after that: Transform? Into what? A penguin?
It was at that moment that I knew what I had to do.
#NoRegrets