A biker holds onto their bike while in the air with a mountin in the background.
A man rides a speedboat near a mountain.
One can either be riding a speedboat or a bike.
exists e1 x1 x2 x3 x4 x5.(n_background(x5) & n_air(x3) & with(e1,x4) & in(x4,x5) & n_mountin(x4) & in(e1,x3) & r_while(e1) & onto(e1,x2) & n_bike(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_hold(e1) & n_biker(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & near(x2,x3) & n_mountain(x3) & n_speedboat(x2) & n_man(x1))