premise: A man leans towards a fire to check on the contents of a pot. hypothesis: A man bends over.
entailment: We can safely assume that the height of the fire is a small fraction of the height of the man, as a fire with a height rivalling his own would be rather dangerous to lean towards.  To be able to see the contents of the pot on the fire, the man has to be right next to the pot and fire; leaning towards an object shorter than oneself that one is right next to involves bending oneself over said object.