A person riding a bike with blue wheels on a tree trunk at night.
Somebody is performing tricks on a bike in a forest.
A person riding a bike on a tree trunk neither has to be performing tricks, nor do they need to be in a forest.
exists e1 s1 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & at(e1,x7) & n_night(x7) & on(e1,x5) & n_trunk(x5) & of(x5,x6) & n_tree(x6) & with(e1,x4) & n_wheel(x4) & a_blue(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bike(x3) & (x1 = x2) & n_person(x1))
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_forest(x4) & on(e1,x3) & n_bike(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & n_person(x1))