THIS EPISODE.
^This will never happen again. Oh Kariya. You sad, sad bastard.
Just to clarify one thing that the anime doesn't really make explicit: due to the worms literally eating him from the inside out, Kariya lost his marbles a loooong time ago. Apparently, Kariya's Big Scene in this episode was written in a hazy, confusing manner in the light novel, as if he could barely even recognize Aoi. So presumably, pre-worm infestation Kariya wouldn't have completely lost his shit in this scene.
Also, I really enjoyed the dialogue between Kotomine and Zouken. If there's one character in the fate franchise who is "eviller" than Kotomine, it is definitely Zouken. Absolutely nothing about that man is likable.
Anything else I could say about this episode has already been said better and with more exuberance by this guy:
