Will you fight 'fire' with 'fire'?

If somehow you’re in a conflict(unavoidable conflict) with some people/someone. He/she start the fight first and he/she wants to light up the fire,what’s your best respond toward this person?. Will you fight back?,calm him/her down?,or will just ignore them?. Do you think one or two harsh word and insults will raise your temper and your will to fight?. Will you judge this person from his/her age,gender,background,relation,or else before you decide whether or not you want to fight back?. Do you realize the consequences from your action?.