It is possible for this intervention to be taken as an incidental digression on progenitorship. But that is not to say that that is what the professor's comment "means": it is clearly a warning: the bully has been warned.
One would think that Shakespeare would claim sole progenitorship, as Lope parthenogenetically does in the first sonnet of his Rimas humanas: Versos de amor, conceptos esparcidos, engendrados del alma en mis cuidados; partos de mis sentidos abrasados, con mas dolor que libertad nacidos (Blecua ed.) (Love poems, scattered conceptions / begotten by my soul upon my sorrows, / offspring of ardent sensation / born less to liberty than to grief.)
Tyson(106) and to attribute Erie(107) vicariously to Holmes instead of to Brandeis, or at least to crown Holmes with the laurels of intellectual progenitorship. This is a temptation one winds up resisting as well.