Two guys are on a rig, and one is looking at the sky.
Two coworkers are hanging out.
The two guys on the rig may not be coworkers. Just because two guys are on a rig does not imply they are hanging out.
exists e1 p1 x1 x2 x3.(n_sky(x3) & at(e1,x3) & Actor(e1,x2) & v_look(e1) & n_thing(x2) & card_eq_1(x2) & exists x4.(on(x1,x4) & n_rig(x4)) & n_guy(x1) & card_eq_2(x1))
exists e1 s1 x1.(a_out(s1) & Manner(e1,s1) & Actor(e1,x1) & v_hang(e1) & n_coworker(x1) & card_eq_2(x1))