You know, I really thought Ruka's dad was going to end up being an evil scientist or something. Considering Ruka barely mentioned him at all in the early memory scenes, and then this fucking cg just topped it off. Just the whole presentation of it, with the ominous lighting, the military guy in the back, and the look on his face. Not to mention most of the HBR dads so far have been assholes.
Then, it just ended up as Ruka not really caring about him enough to be relevant in the flashbacks at all. Poor guy.