@lonnie159 Hey, if you think you have the redirect and a distraction is coming, you have to be 100% prepared to restrain your dog anyway. For me this means I have a semi short nylon strap leash with two handholds so that I'm able to use the full leverage of my upper body strength to hold him back. I'm gripping both tightly and I've squared my stance, and even better if standing where I can lean on something.
Sadly this also means I don't get to prepare treats for counter conditioning unless I keep a few tucked in one of my knuckles while we walk. Each reaction is its own positive reinforcement of the undesired behavior, so it's super unfortunate that I have to give up these little training opportunities. Each interaction should be a step forwards not back. But this is for his safety as well as others'.
To counter those bad interactions, first you need more distance. A wider trail. Some hand picked place for walks. With enough distance you can go back to fiddling with your treat pouch when you notice a distraction.
Talk to your behaviorist, don't listen to some random internet person.