Not Robin, but...
The alternative to not applying pressure would typically be to nick with an ecollar if the dog is at a distance.
In the example that Mary Lynn gave from Mike Lardy's explanation. You would stop the dog with a sit whistle for taking the wrong cast, nick, and then give the same cast again. Although Mike advocates giving the dog a 2nd cast (attrition), before giving the nick.
To continue stopping and casting with no correction with a collar, lead, stick, etc. until you get the desired cast is attrition.
I am curious how you would deal with a dog that continued to go back rather than change directions since you don't use an ecollar? Would you typically use attrition as described by Lardy, or would you go out to the dog and give a physical correction?
Thee collar allows those of us who use it, the ability to give a well timed, measured correction when needed.