premise: A skateboarder is performing a trick in the air.
hypothesis: The skateboarder is riding a bicycle.
explanation_1: One cannot be performing a trick in the air and riding a bicycle simultaneously.
explanation_2: If a  skateboarder is performing a trick in the air then they are not riding a bike.
explanation_3: A skateboarder performing a trick in the air cannot be riding a bicycle the same time.
premise_logic: exists e1 x1 x2 x3.(n_air(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & n_skateboarder(x1))
hypothesis_logic: exists e1 x1 x2.(n_skateboarder(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x2))