>>281565632
The thing is, I'm 100% okay with this being true for mages, Freiren and Fern especially. Mana is controlled with visualization and thought. If you panic in the middle of a fight playing by those rules, you have already lost because you can't use your magic effectively.
Freiren and Fern especially have the thing where they can't afford to let their control over their mana lapse EVER, not even in a fight to the death, or they tip their hand and the ruse of their true powerlevel gets revealed and the game is up. They've trained specifically to always have total control, so I'm willing to believe that Fern can get speared through the shoulder and still have a pokerface about it because that's what Freiren drilled into her.
But we need to be TOLD that its this approach to spellcasting that results in the blank expressions. Warriors and other fighters should still be very emotional in a fight, and we should see mages that START a fight with a pokerface and then that mask breaks in the middle of the fight and from that point on the fight is just completely out of their control.