@mahtan Tanya is a separate matter, but we've already seen that Tanya does face the repercussions for using suicide spells. Neumann was previously impaled and self destructed during the retreat from the Rhine but was healthy enough to fly back and still remain in active duty whereas Tanya was on death's door and pulled from the front. Supporting characters don't have as much focus in this series which is why these injuries that would incapacitate any main character get glossed over, and that is why they have plot armor. Because lesser characters matter so little that their injuries can be conveniently forgotten lets the plot of an invincible wing that has only had 1 combat injury (because of food poisoning) to remain true.