A biker demonstrates his talents in the air by placing only his left arm on the Bike seat.
The biker's arm was in the air.
Just because only one hand was on the bike seat, it does not mean the other arm was in the air
exists e1 e2 s1 x1 x2 x3 x4 x5 x6 x7 x9 x10.(n_seat(x9) & (x9 = x10) & ne_nam_bike(x10) & n_seat(x6) & (x6 = x7) & ne_nam_bike(x7) & n_air(x3) & all x8 e3.((by(e1,e3) & on(e3,x9) & Theme(e3,x8) & Actor(e3,x1) & v_place(e3)) -> (x4 = x8)) & (x4 = x5) & by(e1,e2) & on(e2,x6) & Theme(e2,x5) & Actor(e2,x1) & v_place(e2) & n_arm(x5) & a_left(s1) & Theme(s1,x5) & of(x5,x1) & n_male(x1) & n_male(x1) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_demonstrate(e1) & n_talent(x2) & of(x2,x1) & n_biker(x1))
exists p1 x1 x2 x3.(n_air(x3) & n_arm(x2) & of(x2,x1) & n_biker(x1) & in(x2,x3))