Aakosir
Hm... That is interesting. But I wonder why you can't break the "do not kill" comandment. If you are being attacked you're not allowed to kill your attacker? Even if it means death for yourself??? I believe that you can kill, it it will save YOUR life. But not if it will only improve your health or quality of life.
Or someone else's life.
If you see someone killing someone else, you can't go and kill the first person because you can't decide which life is more valuable.
You know those hypothetical dilemmas like, "You can stop a train that will kill 3 people but you have to block it by pushing over a fat guy and he will die?" Well the answer acording to Jewish Law is that you can't break the commandment not to kill. So you can't kill the fat man. If you follow Jewish Law, the three people will die because you can't push the fat man to his death.
Get it?