Originally Posted by
LFJ
Not sure it was in the "upper thigh". I guess it depends on what kind of shape you're in, but I don't think a blind punch to the thigh would be that much of a bother. That's a big muscle.
The opponent was said to have fallen to one knee, covered his face with one arm and punched in desperation. I'm thinking that would have likely landed on the hip/lower abdomen.
In such a case, close range and sudden, trying to block it with his leg would probably have just caused him to get knocked over. Gaang-sau would have taken care of it.
In any case, it was discussed with Yip Man who gave the advice of using gaang-sau for the situation, so it must have been reasonably applicable there instead of using the leg. Unless of course Yip Man's judgement is not to be trusted.