[Locke had sent texts to Trance and Frost to meet him at the safehouse, where he filled them in on the general happenings. He'd gotten a tip on a Palace and needed some help, and that he saw potential in the person giving him the tip. He gave them instructions to show up around the DA's office and to not stand out.

He wasn't exactly dressed up, but he wasn't dressed down either as he emerged from a corner store near the office holding a bag of snacks and wearing jeans and a t-shirt. If he saw Celeste, he made no indication as he leaned against the store wall, clearly waiting or some friends in a very non-suspicious way]