Two children walking up an enormous staircase.
The children are walking
Walking is typically moving forward, rather than walking up a staircase.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & a_up(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x2) & v_walk(e1) & n_staircase(x3) & a_enormous(s1) & Theme(s1,x3) & (x1 = x2) & n_child(x1) & card_eq_2(x1))
exists e1 x1.(n_child(x1) & Actor(e1,x1) & v_walk(e1))