No person who renders aid or assistance necessary or helpful in the circumstances to other persons who have been injured or are ill as the result of an accident or sudden illness or any mechanical, external, or organic trauma may be criminally charged in this state for having practiced medicine or nursing without a license, provided that the aider shall relinquish direction of the care of the injured person when an appropriate person licensed or certified by this state or by any state or province to provide medical care or assistance assumes responsibility for the care of the injured person.