You run away.
'Reasonable force' is a defence, however, you need to establish that the other person was the attacker and probably that he was not provoked. If strategy 1 doesn't work, (run away) and you find yourself having to use force, at least when interviewed by the cops you can say you ran and when that failed you were forced to defend yourself.
Context/situation is what matters.... egging someone on to hit you, then claiming self-defence is different from someone threatening you, you running away, then you defending yourself.