Zane was led through the gates of Hawthorne and into a relatively large building which currently acted as a command post for the local militia. He was escorted by a series of armed guards, yet despite this fact he remained completely calm and collected.
He was not exaggerating when he said he could wipe out the entire town by himself. And no, he was not mentioning the strength of his horde, which was on standby, waiting to be deployed. Zane's physical prowess was at a superhuman level.
A shot of 5.56 directly to the dome would fail to penetrate his flesh, let alone his skull. Nor would the blunt force trauma have any impact on his brain. Zane was invulnerable to most small arms, including the venerable 50 cal now that his constitution had reached 25.