"What did you find?" Arthur asked when he entered his office which turned out to be his team's office. Daniel already got his table filled with different laptops and PCs. There is a control room where Stefan is watching the monitors surrounding the Twelve Army headquarters, specifically the places where J is frequently seen.
Felix was left in J's office to stand guard.
It has been weeks since J asked Arthur to watch over the Bloodroot Clans movement because she was sure that they would suspect her of the deaths of their bloodlines. And Jacob has been breathing over her neck wanting to keep her in their house worried about her and their twin's safety.
So she has to make sure that everything is under their control before Jacob loses his cool and takes control of her.
While Arthur is monitoring the Bloodroot Clan's activity, he asks Daniel to investigate the person that is behind the killings.