I don't think you can read much into it at all.  As noted, it's hard to predict how one might feel 30 or 60 minutes or a few days later.  Having said that, some common sense enters the equation:  Were he completely goofy and unsteady on his feet.....requiring assistance or even a cart to get to the locker room, I would not be terribly optimistic.  Every data point (including how he looks/acts immediately after) is a piece of information.  I view his 'running off' as a good sign.....but not proof of anything.  Much more 'data' already in hand for the team docs and more to come.