Timeline: SG1: 01x17 "Solitudes", and immediately after BtVS: 05x22 "The Gift".
Disclaimer: Nothing copyrighted belongs to yours truly.
Author's Note: Written for Day 1 of the 2024 August Fic-A-Day.

Falling had been kind of peaceful, at least until she had gone through something that was definitely not a portal. It felt... Not exactly like it was technical, but something she had no words for. Once through, she only had a split second to flip over and catch herself before she hit a wall opposite whatever it was she had gone through. Her landing was immediately followed by some very un-Slayer-like flailing as she had not expected the ground under her to be slippery.

Buffy realized she was in an ice cave at the same as she saw there were other people in there as well. A late twenties blonde woman and a middle-aged man who was unconscious on the ground. A quick survey of her latest icy accommodations didn't reveal anyone else, and neither did she hear anyone nearby.

"Um, hi?" Under other circumstances, she would've been punning right about now, but the events leading up to her current situation were still fighting for her full concentration. Rather than deal with that she resolutely chose to handle her current predicament and figure out everything else later.

Startled blue eyes met her own. "What planet did you arrive from? Do you know where we are and why the gate isn't working?"

"What? What do you mean what planet did I arrive from? We're on-", and she stopped abruptly. Were they still on Earth? Glory's portal was supposed to go to a hell dimension. Were there people there? Buffy glanced over all the ice and snow around them. She had kind of assumed it would be hotter in the hell dimension and now cold...

"I'm from Earth," the lady added when Buffy stopped talking and just kind of looked confused. "The Tau'ri homeworld."

"I'm still with the confusion. Why wouldn't we be on Earth, and who's Taari?"

Now it was the woman on the ground who looking confused. Clearly deciding to start over, she tried again. "I am Captain Samantha Carter of the United States Air Force, and this," and she pointed toward the man laying unconscious beside her, "is Colonel Jack O'Neill. Also from the USAF."

Then she gave Buffy an expectant look. It took a few seconds too long for her to catch up and remember her manners because the military gave her some bad flashbacks. "Oh! Right. Um. I'm Buffy Summers, college student." It seems inadequate in comparison.

"How did you get here if you don't know we're on another planet?"

"Um," Buffy tried to hedge in an attempt to buy a little time to come up with something, anything that might explain it. Except for the truth, because that would not go over well. At least she didn't think it would. Then she tried for a lame, "It's classified." It was better than any lie she could've come up with at least.

Chances were it really was, or would be as soon as the remnants of the Initiative found out about it. Maybe the entire thing was classified by the Watcher's Council as well, she didn't know.

"Classified?" How would a college student be involved in a classified project involving travel to other planets?"

"The classified thing does not involve travel to other planets! That isn't even possible, or at least I don't think it is. I might've missed it though. I don't really have time for TV." School, her sister, her friends, and Slayage didn't give her much time for leisure activities.

"Never mind," Captain Carter waved it off. "Do you know where we are?"

"That's a negatori. I was hoping you would know. And what's wrong with you friend?"

They went round and round for another ten minutes without really getting anywhere before it was decided that Buffy would try and climb up to see if she could get help while Carter tried to keep her CO warm in the meantime.

The climb was a little steep, but with Slayer speed and reflexes, it didn't take long before Buffy reached the top of the crevice and hoisted herself out of it and onto the top of a mountain. There was mostly white as far as she could see. There were more mountains in the distance, but no people, no human (or demon) )-made structures.

Trying to walk somewhere seemed like a bad idea, and not just because the man at the bottom of the ice cave had internal bleeding and a broken leg, but she wasn't dressed for the weather. Her Slayerness regulated her body temperature, but she could still feel how freezing it was, and her mind helpfully supplied how she was supposed to react to that feeling.

Silently calling it a loss, she half climbed and half slid back down. There was nothing for her to fight, her senses weren't telling her anything useful, and she was at a loss on what to do about any of it. This was not her kind of crisis.

Her report to Captain Carter didn't help, and she didn't have anything helpful to add either. In an attempt to keep O'Neill alive she laid down on his other side, opposite Carter, and tried to help with her own body heat. His temperature kept getting lower and if they were not rescued soon...

It wasn't until several hours later she finally got a little hope when she suddenly heard what sounded suspiciously like a helicopter. Not long after that was followed by human voices. She smiled cautiously, hopefully that was the good guys.