Abh and common ault?

it is clear by their action and attitude that you acted reasonably. The incident prior to their returning to you after 15 minutes shows a pattern of intent and you would be right to ume you could be harmed. By getting "right in your face" along with their intent based on behaviour they have committed an ault because you felt in fear of being harmed as a result you took action to defend yourself, this being against TWO men allows your head to be deemed as reasonable action under the law.