Not at all.
Perhaps I didn't realize such a contradiction in what you were saying and what my prof told me, which was that I need to balance the half reaction ATOMS but usually not O and H unless they're participating. Initially I never needed to balance O and H so I had assumed I wouldn't need to later on.
In this case though, O is apparently more integral to the equation than before and thus needs to be balanced? I guess I just didn't see why O was more important here than in the other examples I've been working on. I can figure that on my own though, and I apologize for the confusion.