The man who allegedly viciously attacked Brittny Gastineau was himself badly injured during their altercation ... and his lawyer tells TMZ it was a case of mutual combat. Marquis Lewis -- a famous street artist who goes by the name Retna -- was dating Brittny. He had checked into the London Hotel in West Hollywood a week ago Monday to recuperate from major knee surgery. Retna's lawyer, Michael Goldstein, tells TMZ ... Brittny came to visit a week ago and they got into a major argument.
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