It wasn't due to physical damage, nor was it due to a disturbance in Magic Power, and certainly not a problem with his professional core.
After a thorough examination, Flandre's expression became somewhat conflicted, knowing that the issue lay in Spiritual Power.
Now, Kael's Spiritual Power fluctuated unpredictably. As an energy that existed between illusion and reality, Spiritual Power had always been the tentacles that mages used to interfere with the material world.
And now, with Kael's Spiritual Power becoming increasingly dispersed between the ebb and flow, it indicated that the problem was the instability of his Spiritual Power.
This, however, was easy to solve.
Unstable Spiritual Power could be difficult to handle when alone.
But if external intervention assisted in clearing it, it could be resolved quickly.
