umm yeah, so from that video clip, a stale is basically a japan, only instead of being under the boot, it's by the tail. however, this means, under the trick naming regulations of the IFISSA, that this is to be referred to as a 'tail grab'.
furthermore susan, some people might be inclined to call this a 'toxic' grab.
Getting ridiculous: to avoid arguments/confusion, this should just be called a 'ski grab', which indicates the rider grabbed his ski. As for the trick in that video, it would be called a 360 ski grab.
Getting really ridiculous: why do we need all these labels for tricks? corked, d-spin, bio? when snowboarders spin, they just call it a 360 or 720 or whatever, and how it is spun is just the rider's style. I say, we should just call the trick a 'jump', and whatever the rider does in the air is his style.
(the above comment might not be completely serious)