Watch the Combining Techniques online guitar lesson by Jennifer Batten from Rock Sauce for Rhythm Guitar
The final part of this comp is using the whammy pedal or the whammy bar to drop the chord off the cliff. The band opens up there so the harmonic drop is left hanging which builds tension. Aside from the parts where the whole band is playing the same thing, note how the drums fill during the places where the guitar is sparse, letting the notes ring out. Typically unless the band is doing a unison figure, when one instrument is busy, the others should give it space and not try to compete.