A person who is called on for assistance in an emergency has the immunity from civil liability or penalty described under § 5-617 of the Courts and Judicial Proceedings Article as a result of assistance or advice rendered in: Mitigating the effects of an actual or threatened discharge of a hazardous substance or material; Preventing a discharge of a hazardous substance or material; Cleaning up a discharge of a hazardous substance or material; or Attempting any of the acts in this subsection.