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You know what they say? They say he drinks blood. They say he can't be killed.
— Knox ‧ Batman

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker passes on rumours about a feared figure: that he drinks blood and cannot be killed. Framed as 'they say', the claims are hearsay, yet they build a menacing legend of a monstrous, unstoppable being, whether or not the talk is true.
Context reviewed