Well, as long as Ebon plays innocent and Shiro acts like Shiro, he'll be fine. If a fight breaks out he'll just be on the defensive until everyone else sees Shiro attacking Ebon for some reason, and he'll spin some lie saying Shiro just upped and went crazy. And since Sapphire, Gren, and Abel knows he's on crazy meds, they'll probably think his psychosis has something to do with it before they would suspect that Ebon was screwing with his mind.