Punch them in the Adam's apple: If he can't breathe, he can't physically dominate you. Throw them off their game by saying J.K. Rowling is your favorite author: It may make them angry, but they'll become so unhinged that they'll lose focus.
Say you "self identify" as a peaceful person then knee the guy. While he's rolling around on the ground in pain, remind him YOU self identify as a peaceful person and he's to address you as Mother Teresa...