Quiz question, parts of speech in reflexive constructions with stress pronouns

I answered the "vampires in the morning question" (I have attempted to include the french text several times, but the website keeps reducing to a ">";  i guess it doesn't play nice with ">") and would like to better understand why. Am I correct in that the parts of speech for the "nous" are as follows: 1st stress pronoun, 2nd subject pronoun, 3rd reflexive pronoun? I was, prior to the quiz, under the impression that the first "nous" actually serves as a subject pronoun (auxiliary to the les vampires) and thus I omitted the 2nd "nous" in my answer. To help solidify my understanding, would the following be correct: > or does this construction only form with plural subjects? Merci d'avance!