What is he hitting?
The man is hitting the tennis ball.
    src        edge_attr  dst
0     0  to the right of    9
1     0  to the right of   10
2     3  to the right of    9
3     3  to the right of   10
4     4  to the right of    5
5     5          hitting    4
6     5          wearing    2
7     5          holding    0
8     5          wearing    8
9     5          wearing   10
10    5         swinging    0
11    5   to the left of    4
12    9   to the left of    3
13    9   to the left of    0
14    9  to the right of   10
15   10   to the left of    0
16   10   to the left of    3
17   10   to the left of    9