Two guys are in the air while skateboarding.
guys are skateboarding doing tricks they never had before
Being in the air does not imply doing tricks they never had before.
exists e1 p1 x1 x2.(n_air(x2) & while(p1,e1) & Actor(e1,x1) & v_skateboard(e1) & in(x1,x2) & n_guy(x1) & card_eq_2(x1))
exists e1 p1 x1.(exists e3 e2 s1 s2 x2 x3.(Theme(e3,x2) & Actor(e3,x1) & v_do(e3) & a_never(s2) & Manner(e2,s2) & a_before(s1) & Manner(e2,s1) & Theme(e2,x3) & Actor(e2,x1) & v_have(e2) & (x2 = x3) & n_trick(x2)) & n_thing(x1) & Topic(e1,p1) & Actor(e1,x1) & v_skateboard(e1) & n_guy(x1))