Hello,
The penalties are described in the general rules in H.4. How are these handled? If a team destroys the opponent's stands, the opponent is forfeited. This is also appropriate in the knockout round, as the team whose towers were destroyed is promoted. In the preliminary round, however, the damaged team gains nothing. It loses a lot of points and probably loses places in the ranking.
My suggestion: The destroyed points count in the preliminary round despite the destruction.
Is that a possibility?
BR
Michael