Revelations from the Mouth of a Madman plot question

[Odysseus]

Why are the Ob trying to frame/fit up Brakken?
Rush hires the two orcs to set up the trial. But I can't seem to see an explanation as to why.

 

[RangerWickett]

Because they know Brakken is on good terms with Risur, and discrediting him weakens the party's ability to get in touch with the Bruse.

 

[Odysseus]

thanks,for the quick reply.