The scene is a sweat lodge.  7 red hot stones are brought into the center to begin the purification ceremonies.  The first four stones stand for the four directions.  The 5th and 6th stone stand for Up and Down or Above and Below.  The 7th Stone stands for you- the individual- and the space you now occupy in the center of those directions.  The deer is the intermediary- the human guide that connects with the spirit/nature world and leads the prayers and patterns of the ceremony.