Elsa say next to Jack's lifeless body. His head rested on her lap, she hugged his head while serenading him. 

Anna's body thawed out of the block of ice, she walked to her sister.

"Elsa." Anna said softly, "I can..."

Elsa shook her head. "No you can't Anna. There's nothing left for you to do."

When Anna was in the block of ice, she could somehow hear the voices around her. She knew what would happen of the monster is killed.

"I'm going to stop them." Anna walked into the cave.