I don't know why but I always thought Reiner was the one that killed Annette's father and to mock her he set her up to play the piano in front of the guests- thank god I was wrong because wtaf.
Reiner's so awkward and stiff, its kind of sad. And's its also crazy how he knows so much about her and its the opposite for her.
(please no hate but i do see why they do get back together-but again i do not support reiner's actions in the beginning, even though in his broken mind he thought he was protecting her)