A crowd of people waving red flags are passing under a bridge.
A group of people under a bridge that's about to collapse.
Just because they are passing under a bridge does not mean that it is about to collapse.
exists e2 e1 s1 x1 x2 x3 x4 x5.(under(e2,x5) & n_bridge(x5) & Actor(e2,x1) & v_pass(e2) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_wave(e1) & n_flag(x4) & a_red(s1) & Theme(s1,x4) & (x2 = x3) & n_people(x2) & n_crowd(x1))
exists p1 s1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & Topic(s1,p1) & Actor(s1,x4) & a_about(s1) & exists e1.(Actor(e1,x4) & v_collapse(e1)) & (x2 = x4) & under(x2,x3) & n_bridge(x3) & n_people(x2) & n_group(x1))