§ 6. Volunteer ambulance workers' benefits; general. If a volunteer ambulance worker dies from the effects of injury in the line of duty, or if such an ambulance worker shall be injured in line of duty, benefits shall be paid and provided pursuant to this chapter, except that there shall be no liability for such benefits when the injury has been solely occasioned by intoxication of the volunteer ambulance worker while acting in line of duty or by the wilful intention of the volunteer ambulance worker to bring about the injury or death of himself or another.