Bartsia fell forward out of the hole with Bigwig on top of him. He was not a member of the Owslafa for nothing and was reckoned a good fighter. As they rolled over on the ground, he turned his head and sank his teeth in Bigwig's shoulder. He had been trained to get a grip at once and to hold it at all costs. More than once in the past this had served him well. But in fighting a rabbit of Bigwig's strength and courage it proved a mistake. His best chance would have been to keep clear and use his claws. He retained his hold like a dog, and Bigwig, snarling, brought both his own back legs forward, sank his feet in Bartsia's side and then, ignoring the pain in his shoulder, forced himself upward. He felt Bartsia's closed teeth come tearing out through his flesh and then he was standing above him as he fell back on the ground, kicking helplessly. Bigwig leaped clear. It was plain that Bartsia's haunch was injured. He struggled, but could not get up.
"Think yourself lucky," said Bigwig, bleeding and cursing, "that I don't kill you." (38.43-4)
The violence in this book would give us nightmares if we had read this when we were kids, like that description of Bartsia's teeth tearing through Bigwig's shoulder. But the narrator here also doesn't want to scar us for life (though he does want to scar Bigwig). The narrator continuously comments on the action like a sports commentator, telling us what Bartsia is doing wrong. So we know that Bigwig might get hurt here, but that he's going to come out of it okay, mainly because Bartsia doesn't know his way around a boxing ring.