What effect does the pig hunt and kill have on Jack and the hunters?

Jack draws his knife, apparently intending to kill the piglet. But, crucially he hesitates and the piglet struggles free and escape. Seeing the questioning look on the faces of Ralph and Simon Jack explains that he was choosing a spot to stab the piglet. In reality the enormity of actually plunging a knife into a squealing terrified animal caused him, quite understandably, to hesitate Jack however is ashamed that the others might think that he is weak and makes a point of stressing that next time he won't hesitate