Karl Fostvedt - On3p Skis - Park City from Evan Heath Visual on Vimeo.
you never see the end of the rail during a normal 2, you do during a sw 2, you don't during a sw 4 and you do during a 4(even if your spinning fast and you cant really spot it. Idk if you understand what I'm trying to explain but when you try a sw 4in, you basically can spot the rail because you're always blind.
we can also do that with the spins of rails:
you can't spot your landing with those:blind2,fs4,blind6,fs8
you can spot your landing with those:fs2,blind4,fs6,blind8