I notice that when gybing, NZ keeps the new windward board down and feathers it up and down in the water, providing lift, until the boat is back up to full speed. They get it done in the time limit, but sometimes it is close to the limit (even over the time limit). Might be the holy grail to the perfect execution NZ constantly pulls off.

If it is over the time limit, think the umps will pick it up? I would think that the competing team is too busy to watch and time them.