A man dressed in light blue is doing martial arts on the beach.
A man at the beach.
If he was on the beach then you can say that he is also at the beach.
exists e1 e2 s1 s2 x1 x2 x3 x4 x5.(n_beach(x5) & on(e2,x5) & Theme(e2,x4) & Actor(e2,x1) & v_do(e2) & n_art(x4) & a_martial(s2) & Theme(s2,x4) & in(e1,x3) & n_blue(x3) & a_light(s1) & Theme(s1,x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_man(x1))
exists x1 x2.(n_beach(x2) & a_topic(x1) & at(x1,x2) & n_man(x1))