No, I never mind Buffy questions! I enjoy that they pop up from time to time without apparent provocation.
It’s called a “magic” bullet because there’s literally no way Tara could have been shot the way she was shot. When Warren starts firing, he’s flailing around everywhere behind him as he runs. Tara’s not even the target, Buffy is (though frankly NO ONE is the target, because like I said, he’s running away and just firing blind behind him and hoping to hit her).
While all of this is happening, Willow and Tara are talking in their room (previously Joyce’s room). Their room — absolutely beyond any shadow of a doubt, confirmed repeatedly over the course of six seasons — is on the second floor.
Warren is outside, in the yard, level with the FIRST floor.
Yet when Tara is shot on the SECOND floor, the bullet makes a completely straight entry through the window and through her chest. No angles, no deviations, no nothing.
The only way that would be possible is if someone were outside the window and fired directly at her. Someone was not outside the window firing directly at her. Someone was an entire storey below shooting blindly.
It’s actually physically impossible for Tara to have been killed by Warren’s bullet as we see it happen. Which kind of makes the whole IDEA of it being something real and natural utterly ludicrous. And this doesn’t even touch on the fact that despite standing directly in front of Tara, who has been shot clean through, Willow is utterly unharmed. Where did the impossibly fired and impossibly accurate and now impossibly not-present bullet even fucking GO?
I just rewatched it and when Warren turns around, he points the gun diagonally higher. So it might not be too fartectched.
EDIT: On the next episode and say she was killed by a human in human ways.