Making the "dive bomber" sound

How do you make a diver bomber sound? It looks like it is a combination of a pick sweep and maxing out on the tremolo but I just can't get it to sound right. Any help is appreciated.
# 1

Pull off your string with your fret hand while torking down on the bar. As the string loosens, it buzzes againsts the frets and adds a nice edge to the tone.
# 2