Originally posted by [Censored]
If you really think that your partner is doing wrong, and you feel so benevolently compelled to correct his technique, when it's your turn to be Nage, just do the technique as correctly and as slowly as possible, and your partner will learn it from your action better than from your words.
This only works if your partner has an eye for subtle changes.
I like to believe that if my Kohai does not understand from me showing the example, this means that he's not ready yet for the technique. I have been in situations where no matter how many times my Sempai explained a technique to me, I didn't get it. And then one day, without any obvious reason, I just got it right. I think we all have had similar experiences.