African guy walking the beach.
The Korean man is singing on a stage.
African and Korean are two different nationalities. Walking the beach and singing on a stage are two different actions.
exists e1 s1 x1 x2 x3.(n_beach(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_guy(x1) & a_african(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_man(x1) & a_korean(s1) & Theme(s1,x1) & on(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_sing(e1))