In our group we have some people. That freeze. Some focus on a point ahead of there target location and that helps until freezing. Another ex army vet think s right left right left and he walks away from his frozen point

It sounds like he may have stalled anxiety. A condition people with Parkinson’s develop when in a new or uncomfortable situation. Parkinson’s in some people causes high anxiety and the brain loves to “ freak us out” so to speak. It’s easier said than done but trying to tell yourself anything you can to remain as calm as possible will help At a time like that the brain and the body are not thinking about doing the same thing and the body freezes up getting frightened it’s going to have to perform.

I regularly freeze. I find that after sitting for some time my legs dont work. I have found that a back brace helps deportment - and reduces falling. and I usea walking stick to help balance.

I don’t freeze, but my left leg doesn’t always do what I tell it. When I’m cycling up a hill, I count: 1,2; 1,2 and this helps me keep a rhythm.

I agree with the ex army vet and the marching to get someone who has frozen to move.. My Mum had Parkinson's and used to freeze ad that was the thing I used to get her moving again. Or dance steps.