Here is a picture of a metro link worker making sure all passengers are safely riding on the bus.
The passengers are safely riding the bus.
didn't specify that the worker found the passengers to be safely riding
exists p1 s1 x1 x2 x3 x6.(n_bus(x6) & Theme(s1,x1) & a_here(s1) & of(x1,x2) & exists e2 e1 p2 s2 x4 x5.(a_safely(s2) & Manner(e2,s2) & on(e2,x6) & Actor(e2,x4) & v_ride(e2) & all x7.(n_passenger(x7) -> exists s3.(Theme(s3,x7) & a_sure(s3))) & Topic(e1,p2) & Actor(e1,x5) & v_make(e1) & (x4 = x5) & n_worker(x4)) & that(x2,p1) & n_link(x2) & of(x2,x3) & n_metro(x3) & n_picture(x1))
exists e1 s1 x1 x2.(n_bus(x2) & n_passenger(x1) & a_safely(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1))