A person on a BMX bike is riding on an outdoor course.
A person on a dragon is burning down a village.
BMX and dragon are different things
exists e1 s1 x1 x2 x3 x4.(on(e1,x4) & n_course(x4) & a_outdoor(s1) & Theme(s1,x4) & Actor(e1,x1) & v_ride(e1) & on(x1,x2) & n_bike(x2) & (x2 = x3) & ne_org_bmx(x3) & n_person(x1))
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x1) & v_burn(e1) & n_village(x3) & on(x1,x2) & n_dragon(x2) & n_person(x1))