Construction workers watching a machine at it's work.
Workers pack up and head home for the day.
Watching the machine suggests the workers are at work. When they head home, that usually means they are leaving work.
exists e1 p1 x1 x2 x3 x4.(exists x5.((x1 = x5) & n_work(x5)) & at(e1,x1) & n_thing(x1) & Theme(e1,x4) & Actor(e1,x3) & v_watch(e1) & n_machine(x4) & (x1 = x3) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 s1 x1 x2 x3 x4.(n_day(x4) & for(e1,x4) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_pack(e1) & n_home(x2) & of(x2,x3) & n_head(x3) & n_worker(x1))