Thank you David,
you could do a lot of Ukemi from imperfect or even improper technique. And I promise you, I will even fall for you
I - nearly - fully agree with this post, we could discuss this in depth, but for this thread I am more concerned about a sempai (senior yudansha), who seems not to be able to tell or show his kohai, what was wrong and how to improve, but complains about this kohai to the chief instructor after training. And why the Sensei fulminates against Andy, seemingly without explaining explaining the case in detail.