He gets directly hit in front of everyone in class

It's the middle of combat class and as per usual the first match is jaune vs carden, however for once jaune is putting up a good fight not enough to push carden back but just to avoid injuries and being cornered.

Things are going relatively well until carden manages to disarm jaune of his shield, meanwhile miss goodwitch the combat teacher gets a message from headmaster ozpin that a small meteor is going to hit her classroom.

As miss goodwitch tries to stop the fight, the meteor breaks through the ceiling and hits jaune directly in the chest and he falls over while his body twitches, upon seeing this both teams rwby and jnpr rush down to his side.

As miss goodwitch is about to order them to take jaune to the infirmary they notice him starting to change. (The rest of the class can see from the screens showing both jaune and carden with some students recording.)

The first thing that happens is that all jaune's clothes disappear in a burst of flames leaving him laying there completely naked, then everyone watches as his body changes, from his masculine shape smoothing out and shrinking to become smaller than ruby and his adams apple disappearing to his dick shinking until it's the size of a clitoris, then they realise what's happening to jaune as a vagina begins to form, jaune is turning into a girl, they watch as jaune's belly swells a tiny amount which they assume is the womb forming, and finally they watch jaune grow breasts as big as yang's.

The first person to snap into action is surprisingly yang who takes off the outer shirt of her uniform and puts it on jaune to cover her, ruby runs off to their room and quickly returns with some of her clothes including underwear and pants, as they are clothing jaune miss goodwitch is calling for the medics to come to her class and explaining what happened, not even a minute later they arrive with a stretcher.

Yang immediately picks up jaune and places her on the stretcher as she and the rest of the teams follow them to the infirmary, as they arrive the medics remove the shirt to check the injury, to their shock there's no meteor anymore like it became a part of his body.

After an hour of examination they notice jaune starting to wake up, her eyes slowly open and her breathing speeds up slightly, the first to speak is ruby.

Ruby: "Are you okay jaune?"