Kick the ball.

[dmaggio744]

G40: A ROBOT may not cause a BOULDER to move from the NEUTRAL ZONE into the opponent’s
COURTYARD unless:
A. the ROBOT contacts the BOULDER within OUTER WORKS, and
B. the ROBOT completes its CROSSING (i.e. doesn’t completely back out of the OUTER
WORKS into the NEUTRAL ZONE)
Violation: TECH FOUL per BOULDER

Once you move the boulder into the opponent's courtyard, another robot can take control of the boulder, but your robot must both come in contact with the boulder in the outer works, and pass through the defense. So you cant nudge one through, but I see no harm in giving it to another bot as long as your robot went through the defense.

Hope this helped