Costigan had no delusions about any sense of loyalty between them. The reason he took the gamble in telling Bakura himself was because he hoped that hearing it directly before the announcement would make the other man less likely to spontaneously break their fragile deal. The Bostonian knew that even that wouldn't last forever, no matter how good their relationship in the interim. Bakura was a Sullivan, not a Dignam.

The body language did little more him and so he made an effort to maintain his own neutrality. Costigan shook his head when Bakura was finished, taking another gamble.

"They can still arrest and hold people, even without the prison." He wasn't entirely confident of that, but he said it as if he was. At the very least, he knew Evandau had some something that could nullify powers. "He's giving me the same thing you are: a small say in what happens. The difference is, he trusts me."