Costigan was concerned more with getting out of this situation alive than with anything else at the moment. He frowned when she mentioned Arthur's presence in the kitchen, but he gave a nod and willed his expression back to neutrality as she continued. The undercover was just moving forward toward the kitchen when Arthur emerged and he froze, looking immediately to the man, wondering how, exactly, this was supposed to go.

"That's it? No explanation, nobody guard? How do I know you aren't going to just fuckin'.. murder me and bury the body?" He knew death didn't last here, but that didn't mean it was a pleasant experience.