Official Q&A: VRC 2018-2019: Turning Point
212: What happens to a cap if sg8 is violated?
According to Sg8 balls can not be shot at caps on posts So let's say blue has a scored cap on a post and red comes over and shoots a ball and the cap falls off, will the cap be placed back on the post scored for blue due to the violation?
First, to be clear, shooting Balls at Caps is not considered a legal strategy. Please see this relevant similar Q&A post: https://events.vex.com/VRC/2018-2019/QA/197
will the cap be placed back on the post scored for blue due to the violation?
There is no precedent in the Game Manual for "un-doing" an action mid-Match because the action was the result of a rules violation. Instead, the Head Referee should determine if the action was Match Affecting, and assign a warning or a Disqualification accordingly.
However, please note in the linked Q&A above, this particular action should result in an <S1> violation and a potential Disqualification at the Head Referee's discretion, regardless of if the action was Match Affecting or not.