Logan considered the question for a minute, and he considered what Charlie was saying.
He didn't like or want the help that the detective had to offer. But there was a part of him that realized that the older man was trying to help in his own way. Logan had issues with anyone trying to be a father figure to him-assuming that's what Charlie was doing.
All the same, most people didn't think he was a 'good' kid. In fact, most people decided that he was a lost cause shortly after meeting him. Hearing that vote of confidence went a long way.
"This one's on me," Logan said after the brief pause to collect his thoughts.