So yesterday I was able to ask the teacher from the shinsa tutorial about one of my nagging questions: If you’re in a group of five, say, and the third person is shooting her haya, but drops the arrow, the first thing she’s supposed to do is look over to the shinsa-in and see if they want her to just go ahead and shoot the otoya right away. If so, then she’ll do that (rissha), and then take care of the arrow after she has finished shooting. The question is… do the fourth and fifth people start moving at the tsurune of her shot, or do they wait for her yu after she picks up the arrow?
What the teacher said was that the truly correct way is to wait until the yu, but in a regional shinsa, in the interests of time, the fourth and fifth people could start moving at the tsurune of the third person. So again, it seems like something where you have to think, consider time, place, situation, and then make a decision based on competing factors.