Your brother says that's why you left, because you killed him, that you poisoned him.
6 seconds sound clip from the Strife for Mastery (1978) movie soundboard.
You can hear this line at 00:58:31.575 in the DVD version of the movie.
Quote context
[...]
- I'm sorry. I can't tell you who hired me. I can't.
- Because whoever did hire him was the one who killed your father.
- What? My father's dead? But when?
- You didn't know that? It was just before you left.
- If that was true, I would have had no reason to leave then.
- Your brother says that's why you left, because you killed him, that you poisoned him.
- I also think the killer wasn't you.
- It was the killer who hired this swordsman, and that's why I pressed him so hard, to make him talk.
- Young master, I owed your father a lot, and if it takes all my life, I intend to get his murderer.
[...]