1- To experience some form of brutality in a dream can be frightening until we realise that we are connecting into the darker, more animal side of ourselves. We may- need to deal with fears associated with that side in order to make progress.
2- Unrestrained passion whether sexual or otherwise can appear as brutality and cruelty in our dreams.
3- Brutality can manifest itself in demonic acts of evil. Although rather severe, the dreamer should take note of this interpretation.... Ten Thousand Dream Dictionary