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This stanza is from a poem by Anthony Hecht, titled, "More Light! More Light!". Three men are taken to outside a German wood and commanded to dig a hole. Two of them are going to be buried alive by the third one who then will be shot dead by the soldiers. I'd appreciate it if you could help me with the meaning of the two parts in bold. I cannot get the imagery.

"No light, no light in the blue Polish eye.
When he finished a riding boot packed down the earth.
The Luger hovered lightly in its glove.
He was shot in the belly and in three hours bled to death."
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When he finished a riding boot packed down the earth.
The soldier was wearing riding-boots and pressed the freshly dug dirt smooth with his feet.
The Luger hovered lightly in its glove.
I would take this to mean that the pistol was loose in the holster and ready for use.
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Thank you, Blue Jay. Emotion: smile