Just to disagree - If there were no pain, uke would not move, except to stop his wrist breaking. I think we get used to the pain and so think there is none. The danger is to kid yourself as to the reality. Sometimes, when I 'hear' or 'see' people teaching stuff, I just want to get up and ... eer ...show them how wrong they are. But alas, I am too polite.
So...you never move unless there's pain? Even in Judo that's not the case, IMO.