There is nothing ordinary about this story. That is the secret of its charm. The narrator is numbed by past experience and sees an extraordinary event--an invasion by the undead--with flat effect. And yet, the narrator shudders at the possible coldness of the lake, and softens at the sight of a frightened child. Your description of the scene tells us everything. This is a classic example of show, not tell. You 'show' with extraordinary skill.
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Glad to hear that, I've always wanted to try to show more than telling.
I will comment on the others posts ^_^