I loved these videos when they were first posted here a few years ago, I think before Master Chan passed away. There was a student of his who used to post here, JR Rodriguez. Today I think I appreciate them even more, having moved a little further down the road (I hope).
Among other things, you can see in these videos (especially in the second one from about 1:30 onwards) how he projects such crisp and overwhelming power into his partner's body without throwing a single ounce of his body weight against the partner. Which of course is how it should be. Master Chan remains totally upright, relaxed and rooted (sinking) straight down into the ground at the moments his intent and force go straight forward through his hands/fingers. Just like a movement from a tai chi form, and totally natural (it shouldn't be a contradiction
). So good.