Regarding this article:
http://www.washingtonpost.com/local...2b1a46-428c-11e4-9a15-137aa0153527_story.html
"Cecilia Rodi, owner of Rapture restaurant and bar, said that a bouncer working the doors that night saw Graham walking down the mall. Rodi said that the bouncer later saw Graham speaking with a large man; Matthew is 6-foot-2 and weighs 270 pounds."
It would depend on how much "later" he saw her. He would have been able to see her walk from Rapture to Tuel's, so "later" could be seconds. Or not. So the question is, how much later is later.
Rapture sits between Sal's and Tuel's. If he were watching, he'd have seen JM approach Hannah, and WG behind them.