Slide In Riffing 2

Hi Liam,

I am practicing your Riff Master lessons -- so far they're incredibly enjoyable!

In the Riff Master II main video (http://www.guitarmasterclass.net/ls/Riff_Master_II-Melodic_Death_Metal/) you do a slide after the melodic section (right around the 1:01-1:02 minute mark). In the video, I see your right hand move (as if to push/pull the bridge like a tremolo bar). At first I thought you were doing a pick slide, but then after watching it over and over figured it had to do something with the bridge.
I don't see any bar attached to the guitar, but since it was slightly off camera, it spiked my curiosity more -- plus it sounds bad ass!!

The only time I've seen other guitarists use the tremolo bar (for a slide type effect instead of vibrato/tremolo) is for the dime/harmonic squeal effect -- http://www.youtube.com/watch?v=6TpYcA9bSaU.

Can you explain what you were doing and how you did it?

Many thanks for the great lessons!