Hearing the disdainful remark of the human, Hansel did not respond or show any change in expression, he was getting used to handling his emotions better and better by the minute. Allowing the enemy to provoke you during battle, especially in such a disadvantageous battle, is a recipe for death.
However, even though he was perfectly controlling his outward expressions, his negative emotions increased with every snarky remark or gesture of his enemy. His emotions became so overwhelming from time to time that he could not help but think that even this result may be the work of the treacherous human in front of him.
Unfortunately, Hansel did not have any way of knowing that it was indeed the work of Valtar.