Great find, youre too right about the potential for wasting time though. I really enjoyed watching this clip:
two guys doing some light resistance sparring (i.e. hikitate geiko), interesting to see the guy in black reverse out of an iriminage. I believe he was able to back out because tori didnt have control of his neck, what they call "the friendly arm" at my dojo. maybe too much reliance on the unfriendly arm?