removing delmon and abrams as trustees. redstone's attorney noting this is the first time delmon is raising questions about redstone's mental capacity. after calling him "engaged and attentive" just months ago. with viacom shares down about 40% in the past year, delmon's ceo job is at stake. if he loses his suit, redstone's daughter sherry could push him out, which analysts say could be a good thing. >> in our opinion the only path for shareholder appreciation at this point is a change in management. the currt management team's been in place over ten years. the shares have been consistent underperformers, both operationally and financially. >> reporter: the strategic battle under way now between redstone and delmon is focused on viacom studio. redstone challenging delmon's plan to sell a stake in paramount which he's been pursuing for months. redstone said it's in the best interests of viacom to maintain its full ownership of the studio. for "nightly business report," i'm julia boorstin in los angeles. >>> and the drama tha