A/N: This was originally submitted to me early last month by Frenzy5150 as a "made-up fic title" prompt, and I wound up writing a whole fic for it. I decided that the Domestic Assassin AU would work best for the prompt, since the titular phrase seemed like just the sort of punny thing Elsa might say. A rare Ice Bros fic—enjoy!

"Ice Knowing You"

Kristoff Bjorgman knew that he would find himself in many dangerous or unusual situations working in the police force. Putting on a show for the rest of his his squad that looked good enough, but still allowed the criminal to get away, was far from what he would have expected.

"Look, in that alley—the Ice Queen!" one of the other officers hissed over the radio.

He had obviously spotted what Kristoff now saw, lurking in the shadows—a small blonde haired figure in a dark jumpsuit, carrying a sniper rifle. It was, indeed, the "domestic assassin" that had eluded the police time and time again. She was also his girlfriend's sister, who he had sworn to protect, and that presented a problem.

"Hold your fire!" he snapped. "We can't let her get away, but we're to take her alive." He drew his own weapon. "Understand?"

"Yes, sir!"

Outside of the shadowy Org, Elsa Arendelle's powers of ice and snow were known to only a few. To the majority of the police force, they were just rumor, and what gave her the nickname of "Ice Queen". What they said really made her dangerous, though, was that she was a very competent fighter, both with firearms and hand-to-hand combat.

Kristoff hoped like hell that Elsa really was as good a fighter as she claimed to be, or he would have a lot of explaining to do to Anna. He approached the alley, and shouted, "Ice Queen, halt!"

Elsa looked up, seemingly startled, and started to back away.

"Don't move! Surrender, in the name of the law, or we will have to use force!" He looked her square in the eye, then, and gave her a wink that he hoped no one else saw.

She smirked. Planting one foot firmly on the ground in front of her, she took a fighting stance and called, "Come and get me, then, if you dare!"

"Move in!" Kristoff shouted, and charged, quickly glancing to ensure his men did the same.

The first officer went down right away, slipping on the almost invisible ice that was now on the ground. The next two officers were more wary, but still had great difficulty keeping their footing. Kristoff very nearly fell himself, but he'd had the foresight long ago, shortly after meeting Elsa, to invest in the very best traction footwear.

He smiled grimly. Even those who saw Elsa's magic in person didn't believe it—the icy trick she had pulled here, subtly stamping her foot, could be explained away by her somehow splashing water on the ground without them noticing. Which then iced over. On a warm evening, in July. Right.

Sgt. Wesel, though—he believed the rumors. Kristoff didn't dare tell him that it really was "sorcery" that she possessed, or he would risk revealing his association with Elsa, and put both of the Arendelle sisters in jeopardy. To say nothing of losing his job and probably going to prison himself, for aiding and abetting, obstruction of justice . . .

He shook the unpleasant thoughts away. Right now, he had to focus on getting to Elsa, and then somehow getting both of them out of this. He stood his ground, waiting for his squad to pick themselves up.

Elsa, meanwhile, had jumped onto a dumpster, and was watching the comedic display with thinly veiled amusement. "Are you boys sure that you can catch me?" she said.

"We can try!" one of the officers shot back, hastily charging her again, and again faceplanting for his trouble.

"We have to stop her!" another shouted after watching his friend go down. The second officer stood as best as he was able, took aim with his handgun, and fired.

He had aimed low—probably for the knees—but Kristoff hadn't given any order to open fire. "Hold your . . . fire . . ." He trailed off at the sight of Elsa completely unharmed, as if the bullet had never even reached her.

There were murmurs of "What the hell?" and "Did she dodge it?" The officer responsible for firing the first shot looked baffled for a moment, then let out a wordless yell and proceeded to empty his clip in Elsa's direction. Kristoff watched closely as some unseen . . . something slowed the bullets in midair, causing them to fall short of their intended target.

Now the murmurs changed to cries of "Retreat!" and "Run away!", the other officers turning and running away, apparently scared out of their minds. Now Kristoff was left to face Elsa alone.

"The Weasel isn't going to like this . . ." Kristoff muttered, turning his radio off and walking towards the alley. He felt an unnatural bite to the air as he neared her.

"He'll probably be madder at them for chickening out," she replied, swinging down off of the dumpster.

"Uh, Elsa? How did you, uh . . ."

Elsa waved a hand dismissively, and he heard a quiet tinkling sound behind him, as a large number of icy somethings hit the pavement. "Tiny bits of magic ice floating in the air. Almost invisible to the naked eye, and too small to make much of a sound when hit. Can't afford to let them see me conjuring up anything, so this is a bit more subtle."

"Is this what you do all the time? For a living?"

"When I'm not sniping someone from a tree or a rooftop?" She shrugged. "Yeah, sometimes. It's not always practical, though, and it's not always easy to conceal magical ice." She looked at him then, still standing with his handgun at the ready. "Shouldn't you put that away?"

"I have a secret to protect, too, you know," Kristoff answered, "and I have to make it look like I'm still trying to do my job. In case any of them come back. You know, with reinforcements."

"Sure." She was silent for a moment, then said, "Well, I wouldn't want to disappoint them. And I can't exactly have you following me."

"Wait, Elsa, what are you—aah!" Elsa thrust her hands forward, and suddenly Kristoff was surrounded up to his chest in solid ice. "Elsa, wait, I'll freeze!"

"Oh, you'll be fine, Kristoff. It'll melt fairly soon."

"How soon?"

"An hour or so." She smirked at the horror on his face. "'Ice knowing you, Officer!" With that, she collected her rifle and gear, and ran.

I bet she's been waiting all year to make that pun, he thought ruefully.