Miller was sentenced to "betraying the Spartan Order" and was tasked with filling his time with peaceful hobbies! He was quite resistant to this idea because it felt like doing so would be accepting the accusation, but after some outside influence of friends/acquaintances, he decided to try to save himself the headache...

The threads are still in progress and some of it has been handwaved, so if that's not okay/not enough, we can also say he failed it. Either is okay with me!

He went to the library with Vash, helped Toph with her jewelry making, and practiced some cooking skills with Rogue.