The sight was strange because it was impossible to harm Grendel, but at the same time the sight was wonderful because Grendel's death meant the people would have peace.
Although you haven't shown the text this question refers to, we can see from the context that it refers to "Beowulf."
"Beowulf" is the epic that tells the story of how the Anglo-Saxon hero, Beowulf, defeated the terrifying monster, Grendel. With the reading of this epic, we can say that:
As Grendel was impossible to harm, the sight of his severed head was very strange, as it seemed impossible to happen, but it was a wonderful thing, as the people would be free from his attacks and they would have peace.
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