Charlie didn't stiffen as the Bat moved. He just shrugged at the disinterest in very good fruit and showed his appreciation for said fruit by popping a few more grapes into his mouth. He was lucky that his partner had gotten used to his fruity eating habits; Jennifer did not tell him to stop eating, and sometimes she even indulged in the snacks.
Still chewing, the once LAPD detective pulled the file closer to start flipping through the photos. He paused only once in chewing before continuing. Someone had killed women who looked similar. His eyes lifted from the file, but not to look at any one thing. He was thinking; why did they look familiar?
"Not more than you probably have at the moment." He looked at all the photos, one at a time, then flipped back through them before setting the file down. "Women, all resemble one of the leads of a recent production at the now up and running opera house. All killed with similar weapons in relatively small window of time. I can pull some files, see what was done, any further information - but you could do that, too." Charlie knew the Bat was a very skilled detective after all.
Charlie didn't make an excuse for his ignorance. He didn't say he had a heavy caseload. He didn't even push off blame by saying it wasn't his case. He simply didn't know.
"Of course, if I do have information, you'd have to give in return." He understood why the commissioner had given so much to the Batman, but Charlie wasn't the commissioner. He wanted to bring in the bad ones; maybe if he brought in the criminal, maybe said criminal would stay behind bars longer. It was a very big maybe in this place, but he was more than willing to try.