A view from the ground of a footbridge, with several pedestrians on it, and the view of one man's feet in the center foreground.
A troll is hiding underneath the bridge, waiting to jump out at the people.
You can either talk about the pedestrians on the bridge or a troll underneath the bridge in a given situation.
exists s1 x1 x2 x3 x4 x5 x6 x7 x8 x9.(n_foreground(x8) & of(x8,x9) & n_center(x9) & n_thing(x2) & n_ground(x2) & a_topic(x1) & from(x1,x2) & of(x2,x3) & subset_of(x1,x3) & of(x1,x7) & in(x7,x8) & n_foot(x7) & of(x7,x6) & n_man(x6) & card_eq_1(x6) & n_view(x1) & n_view(x1) & subset_of(x4,x3) & with(x4,x5) & on(x5,x2) & n_pedestrian(x5) & a_several(s1) & Theme(s1,x5) & n_footbridge(x4))
exists e2 e1 p1 x1 x2 x3.(n_people(x3) & n_bridge(x2) & for(e1,e2) & Topic(e2,p1) & Actor(e2,x1) & v_wait(e2) & exists e3 s1.(at(e3,x3) & a_out(s1) & Manner(e3,s1) & Actor(e3,x1) & v_jump(e3)) & underneath(e1,x2) & Actor(e1,x1) & v_hide(e1) & n_troll(x1))