another variation satch uses a lot is to pinch across multiple strings at once.
you need to be pretty handy with
pinch harmonics in the first place, and have a fair amount of gain on to get this to work right, but it's great when you do.
reach over with the fretting hand and dump the bar down (not all the way), then do a pinch harmonic on the g-string but do it real quick and go over the b-string too, then raise the bar with the fretting hand.
if you get it right and both squeals ring out, the different tensions in the strings will make the two notes rise at different rates so you get a cool "phasing" kind of effect between them.
whammy = fun!
--cilve.