premise: Two joggers on opposite sides of a line of trees go down a road in fall, both dressed warmly while still in shorts to allow for freedom of movement. hypothesis: The joggers are hot because it's summer.
contradiction: The joggers cannot be in fall with both dressed warmly and also be hot because it's summer; 'fall' would indicate that it is between October and December, while 'summer' would mean between July and September - people cannot exist in different seasons attired differently simultaneously.