After screaming on top of her lungs for a few seconds until her throat didn't allow her to do so anymore, she zoomed out of the arena, crying, and disappeared from the training hall, without any warning.
Before, she brought back people from the Medical Unit to heal or give him a potion for his injuries, though not even the Unit had expected to see so much blood and the figure in question to just stand there calmly as if nothing worth mentioning had happened.
They scolded him for a minute or two before they poured a small potion over his left forearm that had been turned into a bloody mess as if it had been busted from within thanks to a [Tier-3] black magician's spell [Flesh Explosion].
After potioning the injury, they bandaged it saying that it'll hurt for a few days more and it should, to teach Ken, who stood calmly in a daze, a lesson of being careful with his actions in the future.