Section 19. Exclusiveness of remedy

The benefits provided by this chapter
  shall be the exclusive remedy of a volunteer ambulance  worker,  or  his
  spouse,  parents, dependents, next of kin, executor or administrator, or
  anyone  otherwise  entitled  to  recover  damages,  at  common  law   or
  otherwise,  for  or  on  account  of  an injury to a volunteer ambulance
  worker in line of duty or death resulting from an injury to a  volunteer
  ambulance  worker  in  line  of  duty,  as  against  (1)  the  political
  subdivision or volunteer ambulance company liable  for  the  payment  of
  such  benefits,  (2)  the  political subdivision regularly served by the
  ambulance company of which the volunteer ambulance worker is  a  member,
  whether  or  not  pursuant  to  a  contract for ambulance services, even
  though any such political subdivision is not liable for the  payment  of
  such benefits in the circumstances, and (3) any person or company acting
  under  governmental  or statutory authority in furtherance of the duties
  or activities in relation to which any such injury  resulted;  provided,
  however,  that  the  benefits  provided by this chapter shall not be the
  exclusive remedy as against persons who, in the furtherance of the  same
  duties or activities, are not similarly barred from recourse against the
  volunteer ambulance worker, or his executor or administrator.