I feel like I am activating the parasympathic nervous system when I am doing banded distractions as well.  I definitely feel that way when smashing as well.  I also see that when doing banded distractions it helps to smash as well.  Like when I am doing a banded pre squat hip opener I can feel tightness right next to my knee/quad/adductor  Smash that out and then go back to the hip opener and I am able to start focusing more on my capsule at that point.