there are also ethical justifications for role-specific or skill-specific duties of rescue such as those described above under the discussion of u.s. common law. generally, these justifications are rooted in the idea that the "best" rescues, the most effective rescues, are done by those with special skills. such persons, when available to rescue, are thus even more required to do so ethically than regular persons who might simply make things worse (for a utilitarian, rescue by a skilled professional in a relevant field would maximize the good even better than rescue by a regular stranger). this particular ethical argument makes sense when considering the ability firefighters to get both themselves and victims safely out of a burning building, or of health care personnel such as physicians, nurses, physician's assistants, and emts to provide medical rescue.