There are two workers, one on a ladder, against a blue wall with a yellow-and-black stripe.
A man waits for another to climb a ladder near a wall.
Simply because one man is waiting for another to climb a ladder in no way infers that either of them is a worker, nor that the other man is going to climb a ladder.
exists p1 s1 s2 x1 x2 x3.(against(p1,x2) & with(x2,x3) & n_stripe(x3) & a_yellow-and-black(s2) & Theme(s2,x3) & n_wall(x2) & a_blue(s1) & Theme(s1,x2) & exists x4 x5 x6.((x1 = x4) & rel(x4,x5) & on(x5,x6) & n_ladder(x6) & n_thing(x5) & card_eq_1(x5) & n_worker(x4) & card_eq_2(x4)))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2 x2 x3 x4.(Theme(e2,x3) & Actor(e2,x2) & v_climb(e2) & near(x3,x4) & n_wall(x4) & n_ladder(x3) & n_thing(x2)) & n_man(x1))