How should the following sentence from Allen and Greenough 5.40 be parsed?
Rediit quodsē oblītum nesciō quid dīceret. ("He returned because he said that he forgot something.") --Cicero, De Oficiis 1.40
Literally, the middle clause seems to say "I do not know myself having forgotten", which I suppose is an idiom for forgetting? To say you "do not know yourself". But then how does the quid relate it to diceret? Is that the accusative singular pronoun refering to the clause as a whole, ie, "what he said". If so, then how do we infer "something". If I read it naively, nowhere do I see that he says he forgot "something", it just seems to say that he forgot without describing what he forgot (unless it is the quid that he forgot, in case shouldn't it be quidam--I forgot a certain thing?).