[Boot Hill]

desertcry says:   "The twist is simply a consequence of a spinning wave."

I'm assuming your comment was posted as humor, but in case it wasn't (and for the benefit of other readers), I'll point out that they are distinguishing photons that have spin (spin angular momentum) from those that have twist, or as they also refer to it, orbiting (orbiting angular momentum).

--Boot Hill

[desertcry]

Mostly humor, but as you also know light do have dual nature, as a wave or as photon "particles". It can also have translational and angular momentums.