To be honest, Duncan somewhat regretted his words as soon as he uttered them—he was genuinely afraid that Fenna, this blunt girl, would destroy her own eyes on the spot...
The reaction of the young Judge exceeded his expectations. He had imagined that once he, a top villain, showed himself, it would definitely provoke strong hostility from Fenna. However, he hadn't expected her actions to be so decisive and swift, deducing the critical elements of a Dreamscape invasion and mirror medium almost instantaneously and taking targeted countermeasures, which was completely different from the initial invasion of Sherry's Dreamscape.
She even tried her best to avoid communicating with him, the invader, which was an "emergency measure" to prevent the spread of mental contamination during a Dreamscape invasion.