Biker loses control of bike in midair.
There was a lack of control by the biker.
There was a lack of control because the biker loses control of the bike.
exists e1 x1 x2 x3 x4.(ne_nam_biker(x1) & in(e1,x4) & n_midair(x4) & Theme(e1,x2) & Actor(e1,x1) & v_lose(e1) & of(x2,x3) & n_bike(x3) & n_control(x2))
exists p1 x1 x4.(n_biker(x4) & exists x2 x3.((x1 = x2) & of(x2,x3) & by(x3,x4) & n_control(x3) & n_lack(x2)))