The blood energy of the Nine Sword profession is somewhat like the concentration of essence, energy, and spirit.
After significant consumption, there can be cases of physical exhaustion or even demise.
Louis is aware of this.
This is also an implicit advantage of the charm demon physique.
A charm demon physique that fully supports combat endurance will continuously restore his physical stamina, so long as he doesn't treat advanced martial skills as basic attacks, it's not easy for him to deplete his blood energy.
But Mages and the Nine Sword profession are different.
The source of a Mage's power doesn't come from physical stamina.
So even if the Magic Power is exhausted, there's no risk of physical exhaustion.
The little swan flopping over is purely due to the influence of the constraint vest.
Prior to this, she barely maintained basic mobility by sustaining enhanced magic.
Now, one concentrated fireball emptied her mana bar.
