A man is oblivious to the crowds behind him at the Pennsylvania train station.
A man is holding up the line.
A man can be oblivious to crowds without being in a line, or without holding up said line. He could be sitting on a bench.
exists s1 x1 x2 x3 x4 x5.(n_station(x3) & of(x3,x5) & n_train(x5) & (x3 = x4) & ne_geo_pennsylvania(x4) & n_crowd(x2) & at(s1,x3) & to(s1,x2) & behind(x2,x1) & n_male(x1) & Theme(s1,x1) & a_oblivious(s1) & n_man(x1))
exists e1 s1 x1 x2.(n_line(x2) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_man(x1))