That's what I was thinking too. When WG said he thought she was "distressed" and wanted to keep an eye on her, what was he afraid would happen to her and what did he think he would do to protect her? I assume he thought some creepy guy might come by and try to take advantage of her. Well.....he did, and all WG did was walk away.
JL, after he rounds the corner on the Mall and is following behind a group of people, is walking at a relatively slow and casual pace. At some point he must have zoomed up to pass the group, pass WG, and catch up with HG. That didn't arouse any suspicion in WG? Did JL say something to HG that made it seem like he knew her and that's why WG backed off? Where did WG go?
Also, WG said he saw them stop and talk and that's when he walked away, thinking they were friends. If you believe the time stamps on the two Mall security cameras, and the time stamp on the "two house drinks" receipt at Tempo, then when was there enough time for JL and HG to stop and have a conversation?
For awhile I believed the police deliberately misled the public with the bald, black pants, etc. description as a way to buy some time and keep their real suspect (JL) from panicking. But then I thought about it, and I realized there was really no reason to do that. They didn't have to give any description of anyone. They didn't have to tell the public they spoke with WG. Instead they could've just released the footage with no commentary, and asked anyone with info to come forward.
It's all very strange.