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In general, the town guard, who shoots in the first night, should be attacked, but since he shot successfully, he's alright. And yes, in my opinion, he killed the Tactical Infiltrator, if only because Nebko is right, and his two swords could indeed cut off his head like scissors. Plus, he "uses stealthy methods," and he snuck into the room unnoticed. So everything adds up, and leave the guy alone, or the mafia will start blocking him.
As for the execution, I don't know yet; it's risky to hang the blocked players here.