"If I let myself, I could drop into a trance just looking at those shoulders" (pg. 155).
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I'm going to speculate that Grendel tires of the humans he so easily fights and kills. Beowulf looks like a challenge. Grendel also values the aesthetic. Beowulf is the epitome of the male Viking. Artistically he is powerful in shape and sleek in contour (he's "ripped"). Grendel appreciates this.