Costigan felt almost as uncomfortable with Bakura's casual dismissal of the creature as he did with its presence there. At least now he had a better sense of what the guy could do, assuming there was a whole skill set that came with that ability. In a subtle gesture of peace, an acceptance of Bakura's own offering, he lifted his shirt and jacket and settled them over his gun as if none of it had ever happened.

"I didn't have an assumption," Costigan assured him. It was the truth. The idea of the kid hurting himself or Bakura hurting him intentionally crossed his mind as only vague possibilities that were quickly dismissed. If anything, he would have assumed the kid got them naturally through a hard life. It wasn't like he didn't have some scars of his own and he knew kids who had it worse. Things happened.

He definitely took note of the defensiveness. To the idea of being complicated, he shook his head. "I don't want to know, guy."

A beat, then he remembered. "Bakura. Sorry."

Because either Bakura would tell some sob story that might compromise Costigan's distrust or he would admit to something evil and compromise Costigan's trust. They had a good balance going right now and the undercover didn't want to ruin it.