the idea of (Rejjex)jerking the lure is for a reason. if u see a squid or am octopus swimming it opns its arms and then when it propells itself forwad closes the again. So u have this opening and closing of the tentacles, with a small pause in between.
Thats what we imitate when re jerk the lure for and back. If its feathers they open and close jut like the tentacles.
Also the forward motion helps to set the hook.
Just to add to this. Like any other predator, the least effort used to catch the prey, the less energy wasted. All predators will go for a 'lame duck'. They will target the slowest, the weakest, the injured. So, when a fish is injured, it does not swim in an orderly fashion, but tends to swim in jerks, hence the jerking action! That being said, what 'rejjex' is trying to emulate is an injured fish swiming away from the predator.