I was able to get a hold of a video titled "Original Wing Chun - Grandmaster Yip Chun" The beginning shows Yip Man demonstrating the first 2 forms and then Yip Chun showing all 3 forms. Then Yip Chun demonstrates some chi sao with his student Samual Kwok and another student. Towards the end the commentator states:
"A good master will only demonstrate with a touch where the weak point has appeared. If he punches hard, he is not a good master."
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