A/N: by far the shortest chapter of the ones I've written, but I promise to update again soon. Updating early because of length.
Anna and friends are treated to a strange sight when they enter the ballroom. Snow is falling and much younger versions of Anna and Elsa are playing in the snow. It does not take long for the girls to build the first version of Olaf, inanimate of course. Soon, Elsa is pushing Anna and Olaf around on the icy floor using her powers.
A voice from behind the older Anna causes her to jump. "You and Elsa were caught playing like this many, many times," says Kai.
"What? I don't remember that!"
"After a playtime accident involving Elsa's powers, you were both taken from the castle by the king and queen. When everybody returned, you had no memory of Elsa's powers. That was when we closed the gates, thirteen years ago."
"Catch me!" shouts the young Anna.
"Gotcha!" replies a young Elsa, creating a snow pile under the princess.
Anna, Kai, and even Hazel watch in fascination as young Anna shouts "Again!" A couple of more jumps and the snow piles Elsa is creating are getting higher and higher.
"Slow Down!" cries a worried young Elsa, barely able to keep up with Anna's jumps.
Suddenly, everything seems to slow to half speed. As young Anna jumps off the latest snow pile, young Elsa slips and falls to the ground, unable to catch her sister.
"Anna!" screams a panicked young Elsa, reaching out to her sister, although there is no chance of reaching her across the large room. A blast of frosty air erupts from her hand, striking Anna in the right temple just above the hairline, and pushes her back into the side of the previous snow pile.
With a groan, young Anna slides and rolls down the pile, unconscious. Immediately, young Elsa runs over and puts her sister's head onto her lap. A single lock of hair goes white, right where Anna was struck by Elsa's magic. The older Anna raises her hand to her own hair in the same spot, awe on her face.
The scene changes to a frantic horseback ride to find the trolls. Anna can see and hear the conversation as her memory was altered to protect her.
Again, the scene shifts to one Anna knows all too well, but from inside Elsa's room. Anna can hear herself knock and ask Elsa to come out and build a snowman. Tears stream freely down Anna's face as she watches. She remembers years and years of asking Elsa to play, build a snowman, or just do anything with her. Every time the younger Anna asks, Elsa either ignores her or tells her to "go away."
Looking at Elsa's face, Anna can see the anguish there every time she sends Anna away, over and over, for years on end. Regardless of the pain, she still seems to look forward to hearing Anna's voice. Elsa would often cry into her pillows to prevent Anna from hearing, have uncontrolled weather inside her bedroom, or be generally afraid to touch anybody. Often Elsa would sneak out at night to watch Anna sleep, but she always left if there seemed to be any chance of Anna waking up. There is even a scene where young Elsa tells her parents not to touch her anymore so she won't hurt them by accident. That had to be eight to ten years before the coronation. 'She hadn't had direct human contact in that long?' thinks Anna.
"Is this for real?" whispers Anna, shocked and tears flowing down her face still.
"I believe so. I think she is reliving growing up in her current delusion. From what little I am aware of, it seems exceedingly accurate," answers Kai.
"This is exactly what Elsa saw, remembering giving Anna her white lock of hair, and all the rest. This is what caused the gates to be closed. She couldn't control her powers properly until that day you were frozen into solid ice. Even now, she practices long into the night instead of sleeping, to refine her control."
"Fear will be your enemy, eh?" comments Anna. "That's an understatement. We also wouldn't be standing here like this if that cult didn't fear her."
The scene continues over the years, showing the coronation, running away over the fjord, and raising the ice palace. Anna's visit to the palace plays through, including Elsa's attempts to regain control over her powers after Anna left. Elsa had no idea that Marshmallow, the giant snowman, literally did throw Anna and Kristoff down the stairs, because of the fear her lack of control was having on the queen. Next Elsa is watching from near the door as Hans arrives, dismounts, and start walking towards the staircase to the palace.
Suddenly the scene pauses when Hans starts fighting Marshmallow. Snow starts swirling around the scene and soon the scene is gone, snow and all.
"That scene… never completed," says Anna, looking around stunned. With a quick turn in the general direction of the family wing, Anna calls out "Elsa!" and starts running back to her bedroom.