The Flying Doctors (1986) : 5x18

Michael and Lee visits an old man named Karl. They work for a mining company and wants to do a survey on Karl's land, but he refuses. When they are on their way Michael starts acting more and more agressive. When they stop he goes mad and pushes Lee off a cliff! Michael is found and brought to hospital. After a lot of tests and troubles they found out he had rabies!! After a while Karl tells them there was a girl with Michael, and the search starts. She is found and will be all right. Before she leaves Coopers Crossing she promises Karl no survey will ever be done on his land.