Good. Your terse, one-word answer to Jim – “Physics” – could easily have left a different impression, and did so with me. It also left the impression that you thought that “physics” had shown that self-causation was possible. I see now that you didn’t mean to leave that impression, but that’s the problem with one-word answers that don’t elaborate on anything.
But it’s unwise to jump in on another debate when one hasn’t followed the whole thread, so I’ll bow out here, and let you carry on.