Say in the middle of a match, the blue alliance thinks that a robot on the red alliance has broken SG3 by expanding illegally. What actions should the blue alliance take? What if it is hard to tell whether the red robot has expanded (if a piece of metal is sticking out maybe only a half inch)?
The Blue Alliance should focus on their Match and their Robots. Referees will be watching for violations of <SG3>. After the match, if the Blue Alliance still has a concern, they can politely inform the Head Referee of their concerns.
Thank you Karthik!