[Brother Coa]

Originally Posted by bhl88

Spoiler for Is this a new route?:

Caster is still alive.

It's not, if you remember from original visual novel:

Spoiler for VN:

She attacked them in the yard one day after they rested, she was then killed by Gilgamesh.

What are you seeing here is mix between two routes: UBW and Fate.

The author covered that scene from UBW to explain Caster and her master and then he continued the story with Fate route ( hence the Ilya kidnaping Shirou right after the battle at the church ended ).