From this camera angle I cannot tell whether or not Bonds applies forces to his bat that moves his bat barrel in a negative direction.
The following are my observations from this clip:
1. I noticed that Bonds bends at his waist so that his upper body is leaning toward home plate. I believe batters can rotate with more velocity if their upper bodies are vertical.
2. I noticed that, while the ball is in flight, Bonds moves his bat barrel from a vertical position to a more horizontal position before he begins to rotate his shoulders. I would recommend that he eliminate this movement by starting with the bat horizontal.