Do you call that equitable

“If one man strikes another a blow, that other has a right to defend himself, and to strike a blow in his defence; but he has no right to revenge himself; and if, when all the danger is past, he strikes a blow not necessary for his defence, he commits an assault and a battery. It is a common error to suppose that one person has a right to strike another who has struck him, in order to revenge himself.” – Justice Coleridge, Regina v. Driscoll