Two men in black shirts each standing on one arm.
They are acrobats.
The attire or stance of the men doesn't necessarily imply that they are acrobats.
exists x1.(all x2.(n_standing(x2) -> exists s1 x3 x4.(a_topic(x1) & on(x1,x4) & n_arm(x4) & card_eq_1(x4) & in(x1,x3) & for(x3,x2) & n_shirt(x3) & a_black(s1) & Theme(s1,x3))) & n_man(x1) & card_eq_2(x1))
exists p1 x1.(n_thing(x1) & exists x2.((x1 = x2) & n_acrobat(x2)))