I thought that the knife was special, too. Alistair is very intrigued by it when he gets his hands on it, I think he even calls it exquisite?
I figure the knife came first and the Colt was like the upgrade that happened later. So the knife is special - being able to kill a demon and prevent them from being able to return to Earth is pretty damn impressive and a rare thing to come across - but Colt's version improved on it even more.
The knife is watered down compared to the Colt, too. The Colt could have killed Alistair, for instance, but the knife barely singed him. Made him uncomfortable and clearly hurt but it didn't make him pause at all. The Colt probably could kill an angel too, if Lucifer's comment about it being able to kill all but four things is true, but the knife didn't even make Cas blink.
So maybe the Colt is based on the same magic or technology that the knife uses? But a higher version of it, capable of working on more things and more effectively.
Re: John's and Mary's absence from heaven (small spoilers)
I thought that the knife was special, too. Alistair is very intrigued by it when he gets his hands on it, I think he even calls it exquisite?
I figure the knife came first and the Colt was like the upgrade that happened later. So the knife is special - being able to kill a demon and prevent them from being able to return to Earth is pretty damn impressive and a rare thing to come across - but Colt's version improved on it even more.
The knife is watered down compared to the Colt, too. The Colt could have killed Alistair, for instance, but the knife barely singed him. Made him uncomfortable and clearly hurt but it didn't make him pause at all. The Colt probably could kill an angel too, if Lucifer's comment about it being able to kill all but four things is true, but the knife didn't even make Cas blink.
So maybe the Colt is based on the same magic or technology that the knife uses? But a higher version of it, capable of working on more things and more effectively.