Responses
I think they are not blind I think they are scared that a commoner can strategize period. You have to recall that they had an uprising and it was very bloody, they see him as a possible new smart enemy that they must contain. At least that's how it seems to me.
i really love seeing desir taking charge but i hate that it came at the expense of the students death （￣へ￣）
also, those noble teacher are so freaking blind and narrow minded that they didn't even see how smart desir is in strategizing