kill two birds with one stone

Kill two birds with one stone, somebody once said. Well, I don't know about two, but I think I can be fairly certain that ONE bird is sailing pretty close to the wind.
Geoffrey's obsessive anxiety about his waistline has driven him clean out of his mind - well, that's just my opinion, going by his behaviour.
What happened is this. We had a meeting - me, Geoffrey, the Tupfinder general, and the Fulmars - to discuss what to do about Tuppence's persistent draining of the Fulmar's electric system. Not to mention the racket. We decided after some heated argey bargey that flooding the tunnels with raw sewage was not a great idea. For one thing, Wilson still inhabits a cave in the cliffs, and he would be none too pleased if any of the effluent contaminated his living quarters - which it would - especially if I was directing the flow. ( see previous posts re. my hatred of Wilson)
During the discussion I'd noticed that Geoffrey was becoming increasingly agitated and I was amazed when he refused a top up of madeira. He was clearly very out of sorts. Eventually he sprang to his feet and declared "I will kill two birds with one stone" and flew out of the window immediately.
Apsley and Cherry were alarmed, thinking that he was referring to them, but nevertheless flew after him, and reported later that they'd seen him fly into the tunnel entrance at the old coastguard hut - Tuppence's hideout - word later reached us that in what seems to be a desperate attempt to lose weight he's since been cycling hell for leather on one of the rats exercise bikes (previously used to power up the moog at the lunchtime gig at the Puff Inn some weeks ago) and Tuppence has taken advantage and connected it up to the moog. This means that the Fulmars are no longer having their electrics drained, so obviates the raw sewage option, but we are still left with the problem of the racket.
Not to mention Geoffrey's mental and physical health - he's been cycling without a break for days, and the sweat is lashing off him - we're very concerned indeed.