It is not categorically imperative to never lie nor misrepresent. The opposite is true. There are some situations where "standard" ethical principles (don't lie

It is not categorically imperative to never lie nor misrepresent. The opposite is true. There are some situations where "standard" ethical principles (don't lie, don't kill) are unethical. If left with no alternative, lethal self-defense is not just acceptable, but is morally necessary. An exception to the exception might exist if your attacker is acting justly, but that takes it to another level of analysis.