Running back Arian Foster, who’s presumably dealing with a strained hamstring – neither he nor the team has yet confirmed that’s his injury – returned to a spectating role Friday after having participated in a full practice Wednesday. He’d already missed two workouts and part of a third earlier this week. “He’s doing OK,” coach Bill O’Brien said. “It’s kind of a day-to-day thing. It’s nothing serious. I would assume – (but) guess you can’t assume anything – he’d be back pretty soon.” O’Brien had no comment on Foster’s bizarre interview after the Wednesday practice, when he repeated how he was “just trying to be a good teammate” to every question that was asked. But O’Brien did reiterate how important Foster is to the Texans’ offense, saying he expects him to be “a three-down” back.