When the instructor knows of their apparent experiences for the past year, he does not know if he should be sympathetic for them or not. No wonder they are unphased with the sudden dynamic things that come upon their faces. They are simply numb with them as they had long been hardened by the things that they had seen and experienced.
Leila did not care of the look of the complicated looks sent in their way. What she is concerned with is the origin of the tremors. This earthquake is not made by some tectonic plate moving or some faults acting up. The waves of mana that she sees in the air is telling her that there is a huge fight happening between powerful individuals. The quakes they are feeling are only an aftermath or an effect of their fights.