[AtlUmpSteve]

Pretty close to Dave, but I don't think I want to use the discussion point with a coach that fielders without the ball can't go poof. Standing in the basepath without possession of the ball and not actively (any more) fielding the ball, and hindering the runner (even unintentionally) is the very definition of obstruction; that conversation could easily lead to a protest that might have to be upheld.

In my conversation, the runner was already out before the apparent obstruction, and retired runners have no rights to continue running unimpeded.