Its called Fate Stay Night Unlimited Blade works. New anime, Episode 0 came out last week and this scene is from this weeks Episode 1. Both starter episodes are around 50 minutes long, but from episode 2 on it will be normal 30 minute episodes.
apparently you may need to wait a few days before episode 1 is open to the public, but you should be able to watch episode 0 at least. And im sure you can find the episodes on other sites besides Crunchyroll if you google it.