I actually found the way the student knights handled the behemoth to be stupid. If the thing responded to and can get aggrod by range fire (and it did), why the hell were they trying to pummel it with swords? If the goal was to buy time for people to escape/reinforcements to arrive, they should've focused on baiting it and running away (aka kiting), making sure to avoid the direction of its mouth, which could breathe fire.
I also found the knights defending the wall idiotic. Why did they have to fight (aka get massacred)? They barely slowed the thing down. When they slashed the foot and that didn't work, what made them think doing it again and again would do? Retreat is also a part of strategy. Their CO is a friggin' moron.
I don't like how the writer had to dumb everyone down to make the protagonist look even more OP than he already is.