What happens when Bruce begins to get on his mule and leave the Indian village in the Andes?

When Bruce begins to leave the Indian village, an old man calls to Bruce. The man signals that Bruce should wait. Then the man goes into a hut and brings out a boy about four years old who is very sick. Then other villagers bring out sick children. Bruce has a small amount of antibiotics, so even though it is past the expiration date, he gives a half dose to each of the children.