When he noticed the wound in the half lizard, half gorilla monster's chest, Kaizen's calm expression changed to one of uncertainty, and he hesitated for a moment.
Kaizen had a skill called <Advanced Healing>, which allowed him to heal as much as a healing mage or cleric could for a proportionate amount of his mana. In other words, if he wanted to heal someone badly, it would take a lot of his mana, but if he healed just a little, it would take little of his MP. This skill was very rare, but it was also used once a day, so healing a monster that was trying to kill him was a foolish and risky idea.