Okay, good to know, but all my files cut on the push stroke. Don't know that I've ever seen one that didn't.
It seems as if your making my point,tang on top, being pulled downward into the work.
My apologies then Bruce, but from your video it actually appears that you have a common rattail file mounted with the tapered end pointing up (see video at 1:14 - 1:18) and the tang mounted under the table in the drive collet (see video at 2:08), though in motion and blurred.
Please excuse my incorrect observations and assumptions!