Propagation, Admissibility, Redescription, and Reassignment Applied to a Prior No-Go - No Closed Physical System Internally Fixes the Onset and Direction of a New Causal Chain

This paper applies four conceptual distinctions — propagation versus onset, admissibility versus actual direction, redescription versus determination, and reassignment versus internal fixation — to a prior structural no-go that no closed physical system internally fixes the onset and direction of a new causal chain among multiple lawful possibilities (Zenodo 10.5281/zenodo.19464781). Taking that result as proven, together with results that any proceeding causal chain has an initiation (Zenodo 10.5281/zenodo.20263607) and that a chain proceeding among multiple lawful continuations requires selection (Zenodo 10.5281/zenodo.20264521), the paper establishes a reassignment lemma: reassigning the determination of onset or direction to a prior internal step does not supply internal fixation. The proof rests on a clean dichotomy. A proposed fixing step that lies on the new causal chain itself is not earlier than that chain's onset and cannot fix what it is part of. A proposed fixing step that is earlier than the chain lies outside the closed chain under discussion and is therefore a non-internal contribution rather than internal fixation. The paper restates the prior no-go in fuller form with a clear falsifier.