I must say, I've never seen a pair of automatons have a pissing contest.
As for the Dark Brotherhood, usually they're more subtle but there have been exceptions. A Dark Brotherhood murder might go unnoticed days or weeks after it happens, and sometimes they can be flashy public displays. During the Third Era, a guard captain was killed by them in broad daylight. And most recently, the Emperor's relative was murdered at her own wedding, during the ceremony.
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As for the Dark Brotherhood, usually they're more subtle but there have been exceptions. A Dark Brotherhood murder might go unnoticed days or weeks after it happens, and sometimes they can be flashy public displays. During the Third Era, a guard captain was killed by them in broad daylight. And most recently, the Emperor's relative was murdered at her own wedding, during the ceremony.