A snowboarder glides through the air.
A snowboarder just went off a ramp to do a trick in the air.
Gliding through the air doesn't  necessarily mean going off a ramp or doing a trick..
exists e1 x1 x2.(n_air(x2) & through(e1,x2) & Actor(e1,x1) & v_glide(e1) & n_snowboarder(x1))
exists e1 p1 s1 s2 x1 x2 x3 x5.(n_air(x5) & Topic(e1,p1) & exists e2 x4.(in(e2,x5) & Theme(e2,x4) & Actor(e2,x1) & v_do(e2) & n_trick(x4)) & a_just(s2) & Manner(e1,s2) & a_off(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_go(e1) & n_ramp(x3) & n_snowboarder(x2) & n_snowboarder(x1))