The answer is Grendel's later violence is rooted in his childhood fear and isolation.
Explanation:
The excerpt belongs to Grendel, a novel written by American author John Gardner. This book has its origins in the Ancient poem Beowulf, and in Gardner's book Grenderl is the antihero. In this case, by reading the excerpt, readers can infer that Grendel is violent because of events that happened when he was a kid (mentioning the mother is a great sign of it.)
