Re: Ask sensei to demonstrate "at speed"?
I witnessed a pair of 5th dans (Hauer & Flynn) going at it with gusto. Quite amazing and inspiring and scary, too.
Never crossed my mind to 'test' Shibata I. Shihan ...I did slap his foot once on accident (I think it was already broken or badly strained) but he just kept on with what was going on.
I'd have to say for the most part the techniques were demonstrated at speed - maybe during beginners class things were slowed down a bit but not by much. Half hearted attacks usually resulted in more agony that full on action ever got. At least that is the way I remember events as a 3 kyu ~10 years ago.