Ermon watches the situation unfold, tempers rising. THe thing with Star and Avis gets only a smile from him: really, do the exhibits actually mind someone doing it near them? Mysterium and their artefacts.
Eventually, he rises to address the gathering:
"Magus Striker, the switch was made to avoid conflict of interest as I would not have been able to prosecute properly while being in the same Cabal. I apologise for not informing you, we were going to schedule a series of interviews with both parties and Factotum Pepper and supply the necessary info in the invitations", - he looks briefly from Avis to Striker and back, - "If you would settle this internally and would wish for my help, I would be happy to advise on compensation appropriate to the Lex Magica. Of course, it's not necessary".
He sits back at his table now addressing Striker in a much quieter voice:
"Really sorry, man. About not warning. But I hope you can see why I didn't want Pepper defending you and me prosecuting: it would be a clusterfuck in just so many ways".
And then there is the issue with the spell-casting... Maybe this Consillium needed a Scelesti or something to keep their Arcana in their pants.