The students would judge the instructor solely by their skill when they taught the class.
This method was fairer than the public lecture and relied a little bit on the special instructor's popularity, but because the identity of the special instructor would be unknown, the class was open for free.
Many college students who didn't want to pay some Academy credits for unknown instructors who were undergoing an assessment would usually choose this blind seminar.
Similarly, the candidates who didn't have high popularity outside of the academy would also choose this second assessment method because they could entirely rely on their ability to teach students.
It was hard to say whether the first method was more popular or the second method was more popular, but generally, those who attended the public lecture were at least students with a considerable amount of academy credits.