Board Thread:Chapter and Episode Discussions/@comment-9782468-20141106110941/@comment-1018594-20141107033258

Since Kakashi was shown pulling his headband down and wearing it like normal, I can only assume there was a point in time where he put it back up, maybe for a sparring session or for an actual fight.

This was then followed by a complete pause in the action as Kakashi very slowly and depressingly realized that he didn't have a Sharingan anymore.