The fire department answering any fire alarm, or call, or performing any fire prevention services outside the corporate limits of the city, shall be considered as an agent of the state and acting solely and alone in a governmental capacity. The municipality shall not be liable in damages for any act of commission, omission or negligence while answering or returning from any fire, or reported fire, or doing any fire prevention work under and by virtue of this chapter. (2000 Code § 13-243)