4, actually, since “nobody loved draco and draco loved nobody”, we’re left with Hermione and Harry, which leaves a mere two one-directional options. 2^2=4.
“Draco loves nobody and nobody loves Draco” isn’t a given, it’s a subset of possible “love triangle” conditions which can be ruled out on the basis of their invalidating the love triangle premise. Configurations in which either Harry or Hermione neither love nor are loved by anyone would also be excluded.
4, actually, since “nobody loved draco and draco loved nobody”, we’re left with Hermione and Harry, which leaves a mere two one-directional options. 2^2=4.
“Draco loves nobody and nobody loves Draco” isn’t a given, it’s a subset of possible “love triangle” conditions which can be ruled out on the basis of their invalidating the love triangle premise. Configurations in which either Harry or Hermione neither love nor are loved by anyone would also be excluded.