In order to become an assassin, you have to train. Or, alternatively, you can have your mind uploaded to a machine that tosses it back in time into the body of your Templar-fighting ancestor. That works too. In the trailers for the upcoming Assassin’s Creed, we’ve watched Michael Fassbender’s Callum Lynch jump from roof to roof and leap off of very tall buildings, but before he gets there, he’s got to learn what the Animus is. Marion Cotillard offers him a much too short explanation in this new clip from the movie.

Remember in Spider-Man 2 when the mechanical spine of Doc Ock’s extra arms attached itself to his back with a bunch of needles and he didn’t make a sound? Fassbender’s horrified scream here is a much more realistic approach to having that happen to your body, but, then again, he wasn’t expecting it. The Assassin’s Creed movie introduces a much different Animus than we’ve seen in the video games — it’s like a big mechanical arm that picks you up and lets you hang out in the middle of the warehouse while your mind does its Assassin thing centuries into the past. A far cry from the padded chairs and beds that let the Assassins of the games roam through different time periods in relative comfort. And Cotillard’s Sophia Rikkin isn’t much help, offering Callum a couple lines of vague explanation before sending him on his merry way.

Assassin’s Creed, with its updated Animus, hits theaters December 21.