Okay, so this one was sparked by a fic by mothicalcreatures over at AO3, called 'baby it's cold'. If you haven't read it yet, I advise you to take a trip over and do just that. It just left me with so many ideas, and this is what I came up with.

They were deep inside the Canadian wilderness. A place where no one really needed or wished to be in the middle of January.

"Gaaah… It's freezing!" Mac growled, blowing some heat into his mittens.

"Please tell me something I don't know, kid…" Jack winced and he stuffed his hands inside his coat.

They were trudging through the frozen wilderness, hoping to find the place where an operation called NWX stocked their latest weapon.

"You think we'll find it before nightfall?" Jack asked, "We've been wandering around here for almost a week now…

Mac shrugged, "Sure hope so…"

"Okay, before we freeze solid, let's get going…"

Mac nodded in return, and checked his GPS, "Yeah, we've still got a few miles to go before we can call it a night…"

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They had barely continued walking when it happened. One second, Jack was walking behind him. The next, Mac heard a distressed yelp, and Jack was nowhere in sight.

Mac looked around, and saw disturbance in the snow down the hill they were walking along. Figuring that a wrong step, plus the laws of physics would equal Jack being at the bottom of the hill.

"Jack?!" he called out as he started making his way down the steep hill.

"Jack, are you alright?"

Mac got anxious as his friend didn't answer, so he hurried as fast as his snowshoes would carry him.

"Jack?!"

"Here!" Jack called out as Mac reached the bottom of the hill.

Mac saw the tracks Jack had left, but didn't see Jack. Until he got closer.

"You okay?"

"No!" Jack grimaced, "Get me outta here!"

He didn't have to give the order twice. Mac knew that staying in the ice cold water would suck the heat out of Jack very quick. But once he had Jack out of the water, he would have to find some source of heat for him. Fast.

"Can you grab my hand?"

"Little busy holding on to this ice…" Jack scowled back, as he fought against the current under him.

"Okay, okay…" Mac shouldered out of his backpack, searched the top pocket and came up with a rope. "Can you grab on to a rope?"

"Yeah, as long as I don't have to let go of the ice before I can grab it…" Jack said as a shiver ran through him.

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"Ready?" Mac asked as he got ready to pull Jack out by the rope.

Jack nodded, and let go of the ice.

He let out a long moan as he was safely back on the snow.

"Take off your clothes and run around. Move. Get that blood of yours pumping a bit…" Mac ordered as he started unpacking his own sleeping bag.

"I can't…" Jack growled, as he sat up and started getting his backpack off.

"Jack, it's important."

"I know!" Jack bit back, shivering, "But I won't be walking anytime soon, kid…"

"What happened?"

"My snowshoe caught on something, yanked my leg good…" Jack grimaced as he stripped out of his wet coat.

"Well, is it broken?"

"I don't know… But I do know that it hurts, and my other leg is so cold that I can't feel it at all…"

"That doesn't sound too good…"

Jack gave an agreeing nod, as he started unbuckling the snowshoes, and untying his shoes. The footwear on his left came off easily, as expected. His right shoe and snowshoe on the other hand.

"Mac, I'm gonna need some help here…" Jack winced and pointed at the leg.

"Okay, but first. Put on my coat… You're going to get hypothermia if we don't get some warmth in you quickly…"

"Thank you, but you need to be careful too… It's cold out here, not smart to be running around without a coat for long."

"Well, as soon as you're out of your wet clothes, you're crawling into a sleeping bag." Mac informed as he grabbed a hold of Jack's snowshoe, causing Jack to shout out in pain.

"This isn't good…" Mac whispered to himself, looking up at Jack's contorted expression. "I'm sorry, buddy…"

Jack gasped, and shook his head. "Go on kid…"

He used a few more seconds before he forced out another comment, "It needs to be done…"

"Yes it does…" Mac frowned as he tried to get Jack's foot free, without causing too much pain. "I'm sorry, this is going to hurt no matter how careful I am…"

Jack just nodded, he knew that too.

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"It's already swollen…" Mac said with dismay, as he took a closer look once Jack was dry and inside a sleeping bag.

"What do you think Mac?" Jack hissed, trying not to cry out in pain.

"I think you're right about not walking anytime soon…" Mac winced in sympathy as he started wrapping the leg in and ACE wrap using one of Jack's ski poles to make a better splint to immobilize Jack's ankle and knee.

"Does it look bad?"

"Given that you're squirming like a worm… I'd say it's worth worrying about…" Mac said and settled Jack's leg on top of a waterproof packing bag full of air. "Are you going to be alright with the fire and the sleeping bag until I figure out a way to transport you? There's a cabin a few miles away, according to the GPS and the map."

Jack nodded, but shuddered from the cold.

"Just call out if you need me… I'll try to be quick." Mac assured Jack and nudged his friend's shoulder.

"Yeah, buddy…" Jack nodded, as his teeth was clattering.

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He was freezing, his skin hurt and pulsated from the cold. But that was nothing compared to how his leg was pounding. Because that was off the charts.

He placed his hands at his armpits, hoping that he would get some warmth back in his fingers. He should probably do something about his toes too, but given how bad his right leg hurt, he wouldn't be able to reach them.

He reached up and pulled the sleeping bag a little higher, enough to cover his nose too.

Jack almost couldn't grasp how fast things had gone sideways. One minute, they were on a hiking trip. A long, cold and challenging hiking trip, but a hiking trip all the same. There were no bad guys around, no one was shooting at them. It was safe. One of the easiest missions they had had, 'dangerwise'.
The next minute, he's tumbling down a hill, screwing his leg up to a level he doesn't even recognize. He takes a involuntary dip in some almost frozen stream, and now he can't move around on his own and he's freezing his ass off.

One part of his brain told him to scream for Mac. Hoping that Mac would keep him company and help warm him up faster. The other part of his brain, the part he had learned to trust on missions and when things really went south, told him to sit tight, warm his hands and wait for Mac to build a sleigh or something to transport him to the cabin.

He felt a tear travel down the side of his face, almost ending up inside his ear.

"No, no… I can't cry now…" he moaned, wiping away the cold, wet trail. "I can't do that to myself… Or Mac…"

'Kid is freaked out enough as it is…' he then added, but only in his mind.

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Mac returned a little while later, with an improvised sleigh to transport Jack with. It wouldn't be comfortable for Jack, or easy for Mac, but it would get them from A to B together.

"How are you holding up?" Mac asked, concerned blue eyes searching Jack's features.

"Freezing." Jack grimaced, "And in pain… But… Could you warm my toes? I can't reach them, and they're painfully cold…"

"Sure…" Mac nodded and opened the bottom end of the sleeping bag Jack was nestled inside. "Both feet?"

Jack nodded, and braced himself for whatever discomfort was bound to come next.

The scream that left Jack's throat as Mac gently lifted his injured leg, could possibly awaken the dead.

Mac whispered an apology, which Jack waved off with an 'It's not your fault, kid…'

Jack relaxed as his feet was pressed against the kid's warm stomach. He almost began laughing at the mild explicit leaving the younger agent's lips when the kid noted how cold Jack's feet were against his warm body. Body heat… Still the best way to warm up. That, and hot showers…

Okay, so I'm going to cut this one off here. I have this semi-plan of making this a two/three chapter thing.