I believe The dream is a warning, but also Grendel is saying that he and Hrothgar are connected. Grendel thinks that religion is pointless/meaningless and that it just follows a bunch motions.
Anaphora, it is. Trust me.
Either Ralph will get severely injured or die. Spears are usually a sharp weapon that is made for throwing. Using that and the idea that Jack and his comrades are throwing spears at Ralph will most likely end up as a major injury for Ralph, or even death.
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~Jurgen