Two people leaning over a fence looking at the water.
The people are climbing the fence trying to get away from the police.
Two people leaning on a fence in no way implies that they are climbing the fence trying to get away from the police, there is no way of knowing what their actions or motives for them are.
exists e1 e2 x1 x2 x3 x4.(n_water(x4) & a_topic(x1) & for(e1,e2) & at(e2,x4) & Actor(e2,x2) & v_look(e2) & over(e1,x3) & n_fence(x3) & Actor(e1,x2) & v_lean(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 e2 p1 x1 x2 x3.(n_police(x3) & n_fence(x2) & n_people(x1) & for(e1,e2) & Topic(e2,p1) & Actor(e2,x1) & v_try(e2) & exists e3.(from(e3,x3) & r_away(e3) & Actor(e3,x1) & v_get(e3)) & Theme(e1,x2) & Actor(e1,x1) & v_climb(e1))