What is throwing the ball?
The pitcher is throwing the ball.
    src        edge_attr  dst
0     0      standing on    1
1     0         throwing   11
2     1  to the right of   20
3     1  to the right of    5
4     2   to the left of   20
5     2   to the left of    5
6     3   to the left of    5
7     3   to the left of   20
8     5          wearing   12
9     5          holding    6
10    5          wearing   20
11    5  to the right of   19
12    5  to the right of    9
13    5   to the left of    1
14    5  to the right of   18
15    5          hitting   11
16    5  to the right of    3
17    5  to the right of    2
18    6  to the right of   12
19    8  to the right of   13
20    9   to the left of    5
21    9  to the right of   19
22    9   to the left of   20
23   11  to the right of   12
24   12   to the left of    6
25   12   to the left of   11
26   13   to the left of    8
27   16      in front of   23
28   18   to the left of    5
29   18   to the left of   20
30   19   to the left of    5
31   19   to the left of   20
32   19   to the left of    9
33   20  to the right of   18
34   20  to the right of    2
35   20   to the left of    1
36   20  to the right of    9
37   20  to the right of    3
38   20  to the right of   19
39   23           behind   16