The boy does a skateboard trick.
A boy wipes out while skateboarding.
The boy cannot wipe out (fail) and complete a skateboard trick at the same time.
exists e1 x1 x2 x3.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & of(x2,x3) & n_skateboard(x3))
exists e1 e2 s1 x1.(while(e1,e2) & Actor(e2,x1) & v_skateboard(e2) & a_out(s1) & Manner(e1,s1) & Actor(e1,x1) & v_wipe(e1) & n_boy(x1))