A skateboarder is doing a trick across a rail at an urban skate park
A person rides a bike.
Doing a trick at a skate park requires a skatebaord, not a bike.
exists e1 s1 x1 x2 x3 x4 x5.(at(e1,x4) & n_park(x4) & of(x4,x5) & n_skate(x5) & a_urban(s1) & Theme(s1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & across(x2,x3) & n_rail(x3) & n_trick(x2) & n_skateboarder(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_person(x1))