You ARE trying to "have to" handle.
When the dog "wins" for the wrong reason, it learns to do the WRONG THING.
Because, doing the wrong thing, was what worked.
If the dog is so thoroughly conditioned to return to each leg of the pattern blind, that it disregards a sexy diversion due to it's absolute certainty that it will "win" by lining that leg of the pattern, you have actually created a big problem for your early cold blinds.
Because, cold blinds don't have the very element that the dog was relying on to "win".
And since you so thoroughly reinforced the dog's reliance on knowing the destination, rather than relying on YOUR CAST, you shot yourself in the foot.
Now you need to untrain. And THAT'S not going to be easy. It's probably going to get you....................that wouldn't have been a big issue, if you had spent more time worrying about handling on the three-legged-pattern, rather than lining the legs.more no-go's. more pops. more cast refusals