Sentence one refers to people walking with bikes, where as sentence two refers to men flying.  People cannot be walking bikes simultaneously while flying an airplane.


Context: "There is a street with people walking and walking their bikes, in particular one man in the forefront who have a black cowboy hat and black clothing on and a handlebar mustache." Claim: "the men are flying an airplane"
Considering the context, is the claim true, false, or unknown?