A group of people stand watching something ahead.
A group of people are watching a tornado tear through the city.
Watching something ahead doesn't imply they're watching a tornado tear through the city.
exists e1 p1 x1 x2.(exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_watch(e2) & r_ahead(x3) & n_thing(x3)) & Topic(e1,p1) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4 x5.(n_city(x5) & through(e1,x5) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & n_tear(x3) & of(x3,x4) & n_tornado(x4) & of(x1,x2) & n_people(x2) & n_group(x1))