What is the proper mechanic?

[Hoosier]

NFHS signals for off ball fouls are as follows:

Illegal Screen - Block signal
Holding - same holding signal

There is no team control signal like there is in NCAA. I don't know how well I like the NCAA signal with the punch. If you have an illegal screen, I like the old way of fist, ship the foul and then give a block or whatever actually happened to make the screen illegal. The punch, seems rather confusing, especially if it is off ball.