Maimonides was court physician to the court of Saladin and not only treated these numerous Muslims but he even wrote several treatises for them in Arabic. You probably mean a Jewish physician should not desecrate the Sabbath if there is another doctor who can treat the patient. Not rescuing a Gentile from a river is non-sense as it states clearly in the Torah there should be one Law in the Land, all mankind are in G-d's Image, 'Love thy neighbour as thyself, Do not do until others as you would not have them do unto you etc etc.
Five people killed in car crash near Hebron (Haaretz)
from the article: Police release rabbi arrested for inciting to kill non-Jews