The line "On every sword he had laid a spell / On every blade; but a bitter death / Was to be his fate" best illustrates the dual authorship of Beowulf. This line showcases the blend of pagan and Christian elements present in the epic poem.
The reference to laying a spell on swords and blades reflects the pagan belief in magic and supernatural protection, while the mention of a bitter death alludes to the Christian concept of fate and destiny. This juxtaposition of pagan and Christian beliefs throughout Beowulf highlights the dual authorship of the poem, as it combines elements from both traditions seamlessly.
