A man is midair on a bike over some stairs.
A man performs a trick on his bike by jumping the stairs.
There is no reason to assume that the man is performing a trick on his bicycle by intentionally jumping the stairs.
exists p1 x1.(exists x2 x3 x4.((x1 = x2) & on(x2,x3) & over(x3,x4) & n_stair(x4) & n_bike(x3) & n_midair(x2)) & n_man(x1))
exists e1 e2 x1 x2 x3 x4.(n_stair(x4) & by(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_jump(e2) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & on(x2,x3) & n_bike(x3) & of(x3,x1) & n_male(x1) & n_trick(x2) & n_man(x1))