Unbeknown to himself, the swordmaster subconsciously fears Jayna's fire and prefers to avoid it. This is something like an aversion to dangerous things. This subtle action drastically affects the swordmaster's movement and pattern.
However, he also couldn't do anything about it. It is hard to fight against subconscious instinct suddenly unless they have perfect body control like Angus. Even for Angus himself, he couldn't 100% fight his body instinct. As a result, the swordmaster could only accept his fate.
Jayna finds this trick after experiencing Angus' intense malicious aura last time. She knows that by utilizing her opponent's fear, she could create many openings for a fatal blow.
Jayna is not stupid and reckless. The swordmaster expert is far too strong and experienced compared to them. His experience in close combat and sword skill is so immense that they could be cut into pieces if they relaxed their vigilance once.
