Wrong, wrong, wrong, wrong, wrong, wrong ! ! ! That is tan da, yes (a bit sloppy and not simultaneous) but that's not the way the drill (I gave you) is supposed to go. You don't tan da to the inside of your partner's arm. It should be on the outside of their arm, like the original tan drill. Go back and re-read it again. Hint, the punch should be sliding right along side (side by side) with the tan sao. When the tan da is done, the punching hand should retract back to the wu sao (guard) position. So try it again. And the reason I yell is so you realize you should never do what you're doing again, should you consider it. P.S. I am chilled, I just want him to get stressed about doing it wrong so he'll try harder.