Movie ending that blows mind, Thomas Vinterbergs Hunt

Ending of Vinterbergs great drama Hunt blows my mind, first I was thinking about it for a long time, even for a couple of days after watching, my question was  - whats  the message behind it. The story is great about innocent lie that almost destroys a mans life - brutal, hard story. But this ending...
I was glued to the screen last minutes of the movie, I felt that something bad is going to happen, and it did. But not he way I expected, it raised a lot of questions and versions, it was great open ending...
My version - obviously it was't an accident, it was a warning, a message that people will not forget...
Like You won't forget this great movie for a long time after watching it....