Yuna hardly reacted at all. Although the two young men were vigilant, they were cluelessly unaware. Penny did manage to reach for the handgun on her thigh, but almost instinctively, Charles fired a shot and exploded a round object.
After the round object was burst, it emitted a nasty pus that corroded the ground, hissing with smoke.
Yuna couldn't help but exclaim, "It's a toxic head!"
The two young men were also startled and drew their longswords forward, assuming an attack stance.
Charles glanced at the thing; indeed, it somewhat resembled a head, covered in small tubes, likely capable of spraying poisonous liquid from within. Whether low-level Transcendent's protective Fighting Spirit could withstand such toxic juice was hard to say.
Penny came over with a torch, set it on the ground, and lit the monster on fire.