A man is midair on a bike over some stairs.
A man rides a bike near some stairs.
On a bike implies rides a bike.
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 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & near(x2,x3) & n_stair(x3) & n_bike(x2) & n_man(x1))