In this questions, Are the Minecraft animations hardcoded into the game? why the bounty is still there? Shouldn't it go away, when the answer has been selected?
Bounty awards are no longer tied to accepted answer in any way.
See the blog post: Improvements to the Bounty System
If you are the bounty owner, you can award the bounty to a particular answer by simply clicking the bounty amount icon that appears next to each answer, as pictured below: