Consider this. I will that I don’t want to go to the bathroom anymore. Yet I will still go to the bathroom. Why?
Regardless of the underlying causes of my discomfort, I choose not to go. Yet I will go. Where is this supposed free will you all speak off!!!!
I'd say it's a better example of free will then just going. you have to actively will yourself to not go until you inevitably pee yourself, which at the point you were in pain and were still willing yourself to not go.