I remember in that scene when Sam, Simmonds and Dutch were leaving from their meeting with the Russians cosmonauts, when Sam called Mearing to inform her that this whole thing was a setup from the beginning and that the Decepticons were coming after Sentinel. He also noted that Prime is on it's way and he's 10 minutes behind. How did Sentinel managed to be earlier in that Highway pursuit and be in the city, when he was at the meeting with Optimus and I assume both of the left at the same time. Unless Optimus was elsewhere that he hasn't mentioned. Any one knows?