In all my dreams, before my helpless sight,
He plunges at me, guttering, choking, drowning.
The speaker is now half talking about the present, half about the past. He is evoking the man who died slowly and painfully in front of him, and also his post-traumatic flashbacks to this moment. The description takes the reader at once to the scene that still haunts the speaker, and likely the poet, who is writing from personal experience.
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