He's not up to anything much. He's not very happy at the death of an old friend, that's what's the matter with him!
As they'll need the body as evidence, evidence that one of them is dead!
Some people think it was the drink that did for No.2, well don't forget that No.6 did drink from the same bottle as No.2, and he turned out alright. Mind you having said that, perhaps it was the
who did it. After all he was looking after them, preparing meals, drinks and the like. And in so doing the Butler would have had access to the glasses, and perhaps No.2s glass had been doctored by the Butler previous to his taking a drink. And by that method No.6 would remain unharmed! Butler
Be seeing you