Ok guys... I was given a bit of info that Patrick Dempsey's character is really a Decepticon. Could be another Pretender type? or maybe Rumble in disguise? This is just rumor as of now but it would make sence as to why Sam is fighting him in the movie. Also it has been shown that Dempsey was taken out of that sceen and a green pole was put in to replace him. The pole is for sure a replacement for a cgi character... Dempsey's hidden Pretender maybe?