No, the knife wouldn't dissapear. While on his way to his father he would be hit by a truck, or a plane, or lightning stroke him. Whatever the reason, something happened to him so that he could not kill his father.
If the father lives in the present, it means that his assasination failed in the past.
When psyco-boy goes back in time, it's not like he's re-writing the past, he's just living what was written in the past.
Kinda sucks, but a time traveler that goes to the past really has no free will as whatever he does in the past has already happened.
Slashdot Mirror
No, the knife wouldn't dissapear. While on his way to his father he would be hit by a truck, or a plane, or lightning stroke him. Whatever the reason, something happened to him so that he could not kill his father.
If the father lives in the present, it means that his assasination failed in the past. When psyco-boy goes back in time, it's not like he's re-writing the past, he's just living what was written in the past. Kinda sucks, but a time traveler that goes to the past really has no free will as whatever he does in the past has already happened.