As much Rodolphus wanted to drag Rabastan back to the common room before the hazing took place; as much as he wanted to spoil Lucius' fun, part of him knew he couldn't. He wasn't going to risk any and all status he had in Slytherin house by crossing the headboy even if said headboy was his best friend. Part of Rodolphus had a feeling should he cross Lucius their friendship would mean nothing. He could have been wrong. It would not be the first time for that.
It had not been the first time nor would it probably be the last Rodolphus had hugged his little brother. He did it the night he got sorted into Slytherin house with him, though that was probably the last time.