Bikers race through a forest.
Bikers explode in a fiery ball of death in the forest.
Bikers who race do not normally explode in a fiery ball of death.
exists x1 x2 x3.(a_topic(x1) & through(x1,x3) & n_forest(x3) & n_race(x1) & of(x1,x2) & n_biker(x2))
exists e1 s1 x1 x2 x3 x4.(n_forest(x4) & in(e1,x2) & of(x2,x3) & in(x3,x4) & n_death(x3) & n_ball(x2) & a_fiery(s1) & Theme(s1,x2) & Actor(e1,x1) & v_explode(e1) & n_biker(x1))