Factual error: The force with which Paul thrust the knife into John's stomach, plus the amount of time that the knife was digging into John's stomach as Paul suspended him against the wall, would cause a severe, incapacitating injury - or death. John should have been rendered incapable of even crawling along the floor, but he managed to get up soon thereafter and chase/ fight with Paul in the woods. Miraculously, John also did not seek or undergo any treatment for the stab wound. (01:14:14)
Suggested correction: Whether he should have died is entirely dependent on if he hit any major arteries or organs. Being stabbed in the gut is not an instant death sentence. Additionally, he's running on adrenaline and shock... there have been numerous times someone has been shot or stabbed and been able to run away or fight back in real life. Also, he literally fainted before he could seek out medical treatment, so I'm not sure what your comment about "miraculously" not seeking medical treatment is about. That's 100% conjecture on your part. And conjecture based on no evidence is not a mistake. Obviously he was given medical treatment after he passed out.