Nishani was concentrating too hard to notice him when he entered.
I just had trouble... concentrating.
The words struck her as odd, but she had trouble concentrating when the men launched into a three-way battle.
It was mid-afternoon already, another day wasted with the Council rather than concentrating on preparing for battle.
His ancient place is now occupied by a new functionary, no longer acting as arbiter, but concentrating the forces of the triumphant party.