So I was thinking with the release of images from toy fair and with the deluxe galvatron it shows him having his arm turning into a massive gun. This gotme thinking what if it wasn't lockdown who shoots prime in the trailer. I remember a Scene where Optimus was getting chased by the argosy and also getting shot from above as he was racing along a stretch of road as explosions went of around him. This could indicate maybes cyclonus as a plane/helicopter shooting Optimus and that's who is on the floor behind Optimus when he gets shot and it could be galvatron that shoots Optimus instead of lockdown. The lockdown gun face could be a different scene altogether. Lockdown could come down looking for tessa and see prime in heap and capture him instead aboard the ship. I just think the teaser is not shot in sequence so to speak where we see the argosy, then lockdown transform his head to a gun, shoots Optimus etc because surely Optimus would hear and see lockdown land his ship and be ready for him and not be shoot in the back like his is in the teaser.