Foreign man practicing his balance on a balance mat.
Nobody is practicing.
When there is Foreign man then we cannot say nobody
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_practice(e1) & on(x3,x4) & n_mat(x4) & of(x4,x3) & n_balance(x3) & n_balance(x3) & of(x3,x1) & n_male(x1) & (x1 = x2) & n_man(x1) & a_foreign(s1) & Theme(s1,x1))
-exists e1 x1.(Actor(e1,x1) & v_practice(e1) & n_person(x1))