2. If after an evidentiary hearing held pursuant to subsection 1 the court determines that more than one party has engaged in acts of domestic violence, it shall, if possible, determine which person was the primary physical aggressor. In determining which party was the primary physical aggressor for the purposes of this section, the court shall consider:(a) All prior acts of domestic violence involving any of the parties;(b) The relative severity of the injuries, if any, inflicted upon the persons involved in those prior acts of domestic violence;(c) The likelihood of future injury;(d) Whether, during the prior acts, one of the parties acted in self-defense; and(e) Any other factors that the court deems relevant to the determination.In such a case, if it is not possible for the court to determine which party is the primary physical aggressor, the presumption created pursuant to subsection 1 applies to each of the parties. If it is possible for the court to determine which party is the primary physical aggressor, the presumption created pursuant to subsection 1 applies only to the party determined by the court to be the primary physical aggressor.