The knight keeps an eye on the lion, builds a domicile, raises a family and makes sure his family is wary, the lion keeps finding easier game mostly injured animals breaking from the herd. The lion dies from old age, then so does the knight. We know how this ends. With the knights descendants eventually having to preserve land for the lions and protect them from humans slaughtering all of the lions for fun. The match ends when humanity accelerates the earth into another ice age and is to worried about its own people to think preserving lions would be a good use of their food supplies. Lions go extinct, humans lose a lot… But get a second chance.