person riding a bike doing a wheelie.
A person doing tricks on a bike.
If a person is riding a bike while doing a wheelie, then it would make sense to say that he or she is also doing tricks.
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & for(e1,e2) & Theme(e2,x4) & Actor(e2,x2) & v_do(e2) & n_wheelie(x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bike(x3) & (x1 = x2) & n_person(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_bike(x4) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_trick(x3) & (x1 = x2) & n_person(x1))