That is totally irrelevant. Michael Brown knew of the 'alleged' theft and he had no knowledge of what Officer Wilson knew.
You have a 300 pound 18 year old thug with a juvenile criminal history stopped by the police while leaving the scene of his latest crime with his accomplice. Of course he believed he was about to be arrested and charged as an adult unless he could escape.
Police Chief now says officer might have realized Michael Brown was robbery suspect
http://www.freerepublic.com/focus/f-bloggers/3193465/posts