Who hits the ball?
The player hits the ball.
    src        edge_attr  dst
0     1   to the left of    6
1     2   to the left of    4
2     4  to the right of    6
3     4  to the right of    2
4     4  to the right of    9
5     4  to the right of    8
6     4  to the right of   11
7     6  to the right of    1
8     6   to the left of    4
9     8           behind    9
10    8   to the left of    4
11    9   to the left of    4
12    9      in front of    8
13   11          hitting    7
14   11   to the left of    4
15   11          serving    7