IMO, the core torque happens prior to, or as, the stride foot getting down, not a torque after the stride foot is down. At least that is how I interpreted Rick P.
To me, "slam the door" is the hips are closing at the same time as the arm is delivering the ball. I like to see my DD at or around 45 degrees at release, and if the hips follow closed after the arm has passed, so be it.
Pauly's "Bow-Flex-Bow" in the shoulders (with arms) is very visible here!