A snowboarder in the air with a helicopter behind them.
a helicopter is in the air
Both subjects are in the air
exists x1 x2 x3.(n_thing(x2) & n_air(x2) & a_topic(x1) & in(x1,x2) & with(x2,x3) & behind(x3,x2) & n_helicopter(x3) & n_snowboarder(x1))
exists p1 x1 x2.(n_air(x2) & in(x1,x2) & n_helicopter(x1))