Sometimes, the proper response is to drop your partner on her butt, then explain that while her obstinate attitude is not a problem in application, it is making the current exercise more difficult. I can empathize with the OP because I think he is hoping/expecting seniors to have this ability.
To do it without hurting him? I dunno. This is something that I don't have. Uke attacks and then does exactly the worst thing possible, makes him/herself vulnerable, and doesn't even know it -- no, I don't have the ability to make the technique effective (the technique that we're supposed to be doing, not something else) and not hurt my partner. Maybe some day.