HOUSTON — In case you haven’t noticed, Nolan Arenado has a hard time sitting still. The Rockies’ perennial Gold Glove third baseman is a man of action. When he’s not in the batting cage or taking imaginary swings, he’s perfecting his footwork around the bag and conjuring up his next highlight play in his head. But Tuesday night against the Astros, Arenado was designated to hit but not cleared to field.