Negligence
A rescuer is a foreseeable plaintiff where the defendant negligently put the self or a third person in peril. "Danger invites rescue."
Exception: good samaritan statutes exempting medical professionals from liability for ordinary, but not gross, negligence in voluntarily acting to help someone
Duty to warn or make safe concealed artificial conditions, known to the owner/occupier, involving risk of death or serious bodily injury
+ -
Persons who enter land with permission for their own benefit, rather than the benefit of the owner/occupier. (Licensees include friends and contractors coming on to the premises to make sales or repairs.)
Duty to warn of or make safe any known, concealed dangerous condition (whether natural or artificial)
No duty to inspect
+ - Persons entering land with permission for the owner/occupier's business or as members of the public on land open to the public