A man on a dirt bike in midair competing.
The man is scuba diving underwater.
The man would not be on a dirt bike and scuba diving simultaneously. Midair and underwater are not the same thing.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & Actor(e1,x5) & v_compete(e1) & (x1 = x5) & on(x1,x2) & in(x2,x4) & n_midair(x4) & n_bike(x2) & of(x2,x3) & n_dirt(x3) & n_man(x1))
exists p1 x1.(n_man(x1) & exists e1 s1 x2.((x1 = x2) & n_underwater(x2) & Actor(e1,x2) & v_dive(e1) & a_scuba(s1) & Theme(s1,x2)))