Yeah, so accusative-with-infinitive (AcI) creates a so called "semi-clause" where syntactically the whole unit is actually not a clause (often it is some kind of extended object), but semantically it acts exactly like one. While, if you have some connecting word, a word that introduces a clause (=a clause must have a finite verb: non-finite verb means participle or infinitive) then a finite verb will follow (in an appropriate mood). And "quid" is such a word, quid introduces a finite-verb clause.