The man is skateboarding on a large brick staircase.
A person is doing tricks on his skateboard.
Skateboards can be used for travel not just for doing tricks.
exists e1 s1 x1 x2 x3.(n_man(x1) & on(e1,x2) & n_staircase(x2) & of(x2,x3) & n_brick(x3) & a_large(s1) & Theme(s1,x2) & Actor(e1,x1) & v_skateboard(e1))
exists e1 x1 x2 x3.(on(e1,x3) & n_skateboard(x3) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & n_person(x1))