After losing the sleigh, before finding the castle:
Anna and Kristof walk along under the shelter of an overhang, with Sven determinedly forging ahead and Olaf trailing distractedly behind. With no warning, the overhang falls ahead, narrowly missing the princess but deeply burying the reindeer. Kristof bounds up the new snow drift followed by the less gracefully struggling Anna. The pair digs frantically while Olaf panics theatrically. Eventually an antler is found and the reindeer's ice cold body is soon uncovered. Kristof throws his coat over the stricken animal, orders Anna to stay with him and runs off in search of something dry to make a fire. Anna puts her arms around Sven and buries her face in his musky, dirty fur.
The search is useless, Kristof finds only a few damp, icy sticks. He runs back to the others to find Anna hugging Sven, sobbing into his wet, steaming coat, in a pool of melting snow. Sven wears a baffled but accepting expression. When Sven nudges Anna she gets up with a start. Backing away and staring at her own hands until she bumps into the equally confused but significantly pleased mountain climber. Without a word he builds a small pile from his pathetically cold, wet twigs. Anna kneels, places both hands on the pile, shuts her eyes and strains in an awkward, unflattering kind of way. The sticks drip, steam, smoulder and finally catch alight. The young princess's hands sit comfortably in the fire until Kristof gently taps her and she opens her eyes. She quickly pulls her hands away then, seeing them warm and unscathed, experimentally touches the fire. A little flame sits contentedly on her fingertip. Anna playfully waves it in the mountain climber's face, giggling when he ducks out of the way. She jumps up carrying gentle, glowing flames in her hands and dances around in the snow with them leaving swirling trails of warm, steaming ground behind her.