great video,
look at 20seconds into the video, you can see that he is clearly ahead of vettel entering the chicane
look at 24secodns into the video, he is behind the RBR and has not gained anything from that maneauver.
He clearly passed Vettela and was quickly approaching the RBR in front of him, who by the video you can tell had slowed a bit into the turn. Hamilton had two options, neither of which gained him any unfair advantage at all. He could have crashed into the back of the RBR or he could take evasive action and use the run off area of the chicane to avoid contact, which i assume is what that run off area is designed to do right?
the only issue would have been if he overtook Webber, which he didn't so the call to penalize him is more suspect than clear cut.