It just so happened (since the gates were open 24/7 now) that Elsa and Anna were hosting a beach party that evening and the whole town was invited because they wanted to throw a summer party for Olaf. Elsa and Anna wanted to be as open as possible to the people after what happened last time... And as expected the people loved being able to socialize with people from the castle
There were cooks and maids rushing about helping prepare for a great feast. Elsa and Anna were preparing themselves in their rooms and Olaf was directing the whole thing. He was making it a summer party (if it weren't for Elsa's flurry charm Olaf would have completely evaporated). They were having the party on the beaches of Arendelle and Olaf was loving it. He had all that he ever waned in just one big party. It was summer and Olaf was having a beach party all just for him. Olaf was just about the happiest snowman on earth (kind of ironic when you think about it: a snowman at a beach party).
Anna felt terrible on the day of the party when she was getting ready in her room. She still had that burning pain in her heart. She had decided not to talk to Kristof about this pain because she feared that he would make her stay in the hospital wing forever. But Anna also felt unusually angry also and she was beginning to think a beach party for a snowman was kind of stupid.
She walked outside and lightened up because it was a beautiful day. She walked down to the beach while wearing a two-piece (after all Kristof was there too) and congratulated Olaf on having his beach party.
She and her sister had a wonderful time (although Anna was a bit grumpy) which may or may not have included the influence of alcohol. But on her was back to the castle Anna's pain began to grow stronger. So strong that she bent over and screamed in agony. "AAAAAAAAAAAAUUUUUUUUUGGG- GHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!". Kristof began yelping for help or a doctor or something! "Get away from me peasant" Anna yelled at him when he tried to help her up. "Anna" he said in disbelief "you've never talked to me like that in your li-" "I don't care! Get me away from this place!" she cut him off. "Anna I-" he stuttered. "Fine, I'll do it myself". She flared her hands back and as she did sparks began to fly out of them. And then sparks became flares. People started to back away and shield their children. Soon Anna was literally going up in flames but she didn't feel a thing because she was so consumed by her anger. "Is that how it's going to be Elsa?! Where you always get all of the power?!". She was now enraged with every one for not agreeing with her. "FINE. You can have Arendelle. But I'll take the forests with me and the trees and the animals!" "Anna what are you talking about-" "You got everything! and I got..NOTHING! Then she made a huge flare and every one took cover. Then she ran off into the forest and was gone.
But that flare had taken Olaf's flurry. The flurry that he was so proud of. An the flurry that kept him alive. So as Elsa helped all of the citizens recover she didn't notice him until the last second. And she watched him disintegrate before her eyes.
