Also also your version is now slightly ambiguous since it is not clear whether Froderick is speaking Twin EarthEnglish or English If he is speaking English and just happens to be on Twin Earth ie if he is Fredericks identical Earth twin and has been transported there unbeknown to him then the context is not enough or may not be enough  there is I believe some debate about this point to change the meaning of his words and so his words may mean the same as Fredericks That is why the point was made explicitly in my last version