Can a boat giving mark-room prevent a boat owed mark-room from tacking? [Sailing Rules 2021-2024]

[@dutchflats]

Does sailing proper course by the blue boat not apply in this case, what reason could the blue boat give for not promptly tacking to fetch the mark?

[@racingrulesgeek]

None of the rules on proper course applied to the blue boat as they passed the mark. Here’s a video summarizing all the rules that mention proper course: ua-cam.com/video/MwvDfISS8Ic/v-deo.html