Years ago, I made the mistake of asking Sifu to show me a 'projection' and found myself pitched across the room.
The application wasn't painful at all.
In truth, I never even felt it.
I landed in a heap on the floor before I knew what was happening.
Everything went "Crunch!"
The truth is that I wasn't ready for it. My body wasn't ready for it. My nervous system wasn't ready either.
I lay on the floor and wondered if I was ok.
Sifu will sometimes indulge a student's curiosity, but this is not always a good thing for the student.