Derek knew that Brian was lying, if only by omission, but he wasn't the only one and those were the ones they knew about, and of course, he did not need Brian to come up with any more suggestions.
"You know something, let me and Callen discuss your idea. You guys stay and talk." He looked at the other lead. "Come outside with me for a moment." Whatever they decided to do, they should be on the same page with this, because Callen was about secrets and he was about transparency, but there were a lot more things at play that their personal styles and beliefs.