Symptoms for Hypothermia:

Shivering, which may stop as hypothermia progresses.

Slow, shallow breathing.

Confusion and memory loss.

Drowsiness or exhaustion.

Slurred or mumbled speech.

Loss of coordination, fumbling hands, stumbling steps.

A slow, weak pulse.

In severe hypothermia, a person may be unconscious without obvious signs of breathing or a pulse.

Death

Jaune cursed as he weakly punched the snow covering the cave, "D-dammit! I-I can't-t push t-through!"

Ruby shivered slightly as she tried to wrap herself in her cloak, "It's cold..."

Jaune gave the wall of ice a final glare before taking off his backpack and rummaging through the pouches. He sighed in relief as he pulled out a supply of red dust, already feeling the faint heat emanating from the vials of dust. He carefully set up a cloth that was designed to burn hotter and for longer and carefully poured a bit of red dust on the corner before flaring his aura. Immediately flames sprang into existence and Ruby almost gasped in relief. Jaune carefully checked over himself and his clothes before he began to strip.

Ruby gasped and covered her eyes, "Jaune?! What the hell?!"

Jaune hissed as the wet clothing slid off his body, chills dancing deeper along his skin, "Read-d ab-bout hypot-thermia... Need to g-get wet c-clothing off b-before ch-chill really sets in."

Ruby nodded and looked away, face burning, thanks to Jaune, her clothing was still dry enough that she could wear them with no danger. She did slide off her boots and leggings as the snow had damped them thoroughly.

This wasn't supposed to happen, it had been a relatively simple request from a village to kill some grimm that had been inhabiting the mountains. Ruby had been slicing them to ribbon with Jaune and Ren before Nora decided to try to use Magnahild on one (ignoring Jaune and Ren both screaming for her to stop).

Jaune had taken a look at the mountain before scooping her up in his arms and running down the mountainside (the deep snow was hampering her ability to sprint through the area), and she gasped as an edge of ice shifted and began to rumble as it tumbled in a wave of white. She tried to get him to let go, he was already exhausted and shivering, but he simply clenched his jaw and told her he was fine. The grim - a few creepers and beowolves - barely had any time to even look up before the avalanche swallowed them. Jaune saw an outcropping of rocks and screamed at Ren and Nora to get to the village and get help before lunging at the small alcove. Ruby watched in horror as he simply tossed her in the small shelter as the wave of ice crashed down on him.

She would be damned if she just sat there as he died for her.

She grabbed his hand before he was fully swept away and yanked him in.

"Jaune... What do we do?" She asked the chilled strategist.

Jaune skin was pale, lips blue, and he took a shaky breath, "P-pray," Jaune swallowed, "and hope that hypothermia won't kill me."

Ruby's eyes widened before narrowing, "Don't say that!"

Jaune tried to chuckle but was more of a broken exhale, "S-sorry Crat-ter Fac-ce."

They both didn't comment on how weak he sounded, he opened his bag and sighed in relief as he pulled out some dry pants and a t-shirt.

He moved away from the fire slightly, body twitching, and Ruby growled, "What are you doing?!"

He took a moment to clench his eyes shut and tried to shiver before exhaling a raspy breath, "H-have t-to get-t my internal temperat-ture up before anything else," Jaune coughed weakly,"or my blood-d vessels will open too fast and I c-could have a heart-t at-ttack due to low blood-d pressure."

Ruby paled, "Can I help?"

Jaune blinked and looked embarrassed, "Um not-t really... it's f-fine, I-I'll b-be okay."

Ruby glared, "Jaune. How. Can. I. Help?"

Jaune shivered and relented, "Cuddle up to me."

Ruby blinked and her cheeks felt decidedly hotter than normal, "What?"

"S-share b-body heat." Jaune mumbled, shrugging awkwardly, "Sorry... It's s-tupi - R-ruby?!"

In the time he was stuttering out his apology, Ruby simply seemed to resign herself and stalk over to Jaune before wrapping him in a hug.

She noted Jaune chest was more muscular than his black hoodie showed.

Ruby also noted that this observation did not help her control her blush.

"You saved me," She replied, "I'll save you too."

"Ruby..." He began sounding pained, "I have to t-tell what'll happen if this gets w-worse, let me get -tto the fire though, I-I t-think I can n-now."

She nodded and as she expected him to get up, he stumbled over the simple motion and face-planted straight into the floor.

"Shit... It's worse than I thought..." He murmured tiredly.

Ruby dragged him to the fire and lifted him up, "What do I need to know?! Tell me! Please!"

Jaune gave a jaw-cracking yawn, "As this g-goes on, I m-may have bouts of amnesia... I'll be forget-t-ting more and more, I m-may be able to recall everything in some instances, but don't g-get your hopes up. T-tell me what our status is and say h-help is on t-the way. If this gets worse, I'll stop s-shivering and my b-body movements will become sluggish and even more unc-coordinated. My skin will prob-bably bec-come b-blue and my blood-d will s-stop flowing. Wh-hen I am getting closer to d-death, I will want t-to curl up and die...h-hide-and-die. Don't let me, kay?"

Ruby nodded frantically.

T-things are b-becoming blurry..." Jaune breathed, eyelids drooping and face screwed up in consternation, "I think-k I-I'm forgettin' something...

Jaune tried to stay awake but couldn't hold it, his head lolled and he slumped against Ruby.

"Jaune?! Jaune! Wake up!" She pleaded, "Don't leave me alone!"

Jaune simply hummed in slight annoyance and frowned but didn't wake.

Ruby was alone.

After some time, Ruby had dragged Jaune as close to the fire as she could and cradled his head in her lap. She was biting her lip and glaring at the wall of ice, praying that Ren and Nora would hurry.

Jaune eyes cracked open and Ruby jolted up, "Jaune?"

"Wh're are 'e?"

"The cave in."

"Kay..."

"Jaune...?"

"Mm' tired..."

He slipped away again.

Ruby was running her hand up and down Jaune's arm, try to warm him up with friction.

"Ruby...?" He mumbled.

"Jaune! I'm here!" She said, a hand moving to brush some of his hair out of his face.

"Where are they?" He whimpered pitifully.

"They'll be here soon, okay?" Ruby whispered, feeling as though his pained tone was stabbing her.

"'Kay... you... promise?" He murmured, voice waning.

"Yes... I promise..." She choked out.

As he slept, Ruby sobbed.

In all honesty, I was inspired by a YJ fic I read a while back, but anywho, I really wanted to make this a one-shot but lost alot of the inspiration for it... ah well... There was supposed to be more than this but really just having so much trouble with it.