As a stand in for Oracle, Tim had eyes all over the city. Most of them were focused in and around potential threats, while others were delegated toward areas that needed to be monitored for protection. A choice few were set up for specific individuals, to log their each and every recorded movement, such as the live Joker feed that Oracle always had up and running. The one Tim had personally set up for Stephanie was similar to that, and it was through that technology in conjunction with how well he knew her that he was able to tell where she was going before she even reached her point of destination.
...Which allowed him to actually be there, and hear her words as she spoke them. Once her little commentary would have made him smile, and often laugh, but he was not certain he could bring himself to do either given what had happened in his life recently. And especially because of what he had come to tell her.
"Maybe you should just give the note right to me, then", Robin said as he stepped out from behind Stephanie. "It's probably not something you would want the GCPD to find either I imagine."