Is the man behind the wall?
No, the man is in front of the wall.
    src        edge_attr  dst
0     0           behind    8
1     4   to the left of    6
2     5   to the left of    6
3     6  to the right of    4
4     6  to the right of    7
5     6  to the right of    5
6     7   to the left of    6
7     8          wearing    5
8     8          holding    6
9     8          wearing    7
10    8      in front of    0