21:40 scenario. You are the leeward boat trying to make the pin at the start. Before the start, you have luffing rights. After the start, you don't have luffing rights. Correct? So if you are trying to make it around the pin and the starting gun goes off, can you still luff up and use momentum to get around the mark if there is a boat immediately to windward of you and would also have to luff?
