(二者の中)一方を他方と間違えるkilling each other by mistake: killing each other by mistake同士打ち同士討ちどうしうちどしうちto mistake s'one for s'one else: to mistake s'one for s'one else見誤るみあやまるacknowledge one's mistake: 自分{じぶん}の過ちを認める