Under the common law, you are not legally required to assist a person in peril if you had no responsibility for their injury.A recent incident in the Grand Canyon National Park raised some of the underlying issues that we debate in our discussion of this doctrine.... They were on their third or fourth day out and had another three or four days planned.... They then left the seriously injured man behind and continued their trip. INJURED GRAND CANYON HIKER, 63, SAVED AFTER FRIENDS ABANDONED HIM