People strolling casually across a bridge.
People jumping off the bridge
People strolling across the bridge and not jumping off the bridge.
exists e1 s1 x1 x2 x3.(a_topic(x1) & across(e1,x3) & n_bridge(x3) & a_casually(s1) & Manner(e1,s1) & Actor(e1,x2) & v_stroll(e1) & (x1 = x2) & n_people(x1))
exists e1 s1 x1 x2 x3.(n_bridge(x3) & a_topic(x1) & a_off(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_jump(e1) & (x1 = x2) & n_people(x1))