----With that Tan you don't have to bring in a lot of conceptual twists and turns to justify it being a punch.
You just have to not understand the concept in the first place. Then it easily becomes whatever you want!
With the Tan, you simply close your hand into a fist and you can feel that it is a valid punch. Same thing with the Bong. No great stretch of imagination needed!
If you don't understand the concepts, it's just a matter of putting a fist on the end.
The energies will be entirely different, but if you didn't know that, it doesn't take any conceptual twist. Great!
And the "bouncing punch" from most Ip Man WCK versions of the Chum Kiu form is essentially that....a Tan Sau as a punch.
There's a reason in all the position changes in pun-sau you never end up with taan-sau having contact on the inside of the forearm.
If you don't know the reason, then any time your palm faces upward you can call it a taan-sau, despite it having nothing to do with the hand, and possibly being the exact opposite in concept.
Same with the Bong being an overhand punch. Many Ip Man WCK versions of Biu Jee have this punch in the form without going to conceptual convolutions to justify it.
That "punch" is not a bong-sau, and the only way to turn bong-sau into an overhand punch is to completely castrate the concept and elbow use from it, as you've done to taan.