I have this somewhat weird visual about jumping rope and canter to walk. I used to jump rope a lot as a kid, mainly in groups, so two others were holding the rope whilst I and other children jumped. You have to jump in and out at the right time while the rope is going in order not to get tangled or disrupt things.
Similar to canter walk transitions. You have to be aware and ask at the right time in order for it not to be disruptive, awkward, or otherwise not good. At the same time you still have to keep some momentum going.
I basically pictured the rope coming at me, still high up, and this would be when the horses poll is the highest in canter, and as the rope came toward me and down to the ground I imagined following it with my seat. As in I sat back and down into the transition, but also lightened my seat right away (as the rope would leave the ground for the next cycle) to allow for a good forward walk and not just dumping into the walk and losing momentum.
So I sort’ve sit back, down, but keep my core engaged and make sure that we transition out of canter and into a nice walk keeping the hind end active throughout (not dumping on the forehand for example) and thinking “upwards” and forwards.
No idea if any of this makes sense to anyone else 