The guy who got stabbed got what he deserved. If you threaten to kill and then start fighting then IMO it should be assumed that the person is intending to kill and so all means should be allowed to be used to stop him, preferably without killing him but if its a choice of him or you, then he deserves what happened to him.
As for getting arrested, well the police are just doing their job, and would be silly for them not to arrest the guy. If he should go to jail though, well I dont see what he did as being anything other than self defence and the defence of his son when his life is in danger.
As for getting arrested, well the police are just doing their job, and would be silly for them not to arrest the guy. If he should go to jail though, well I dont see what he did as being anything other than self defence and the defence of his son when his life is in danger.