premise: Two people are sitting on a rock looking off into the distance. hypothesis: The diver is swimming up to the water surface.
contradiction: It says the two people are sitting, so one of them cannot be diving to the waters surface.|contradiction: THE DIVER IS  SINGLE PERSON AND NOT TWO PEOPLE AND THE DIVER CANNOT BE SITTING ON THE ROCK AND LOOKING OFF INTO THE DISTANCE.|contradiction: The subject is either a diver or two people. The subject is either swimming or is sitting.