"What's wrong?" the Mirror Demon hurriedly asked.
Before she had even finished speaking, Shen Luo grabbed her by the collar. With a flash, he retreated rapidly from behind the boulder and disappeared into the dense fog.
The moment the three of them moved away, a streak of black saber light shot over. Rather than a fiercer slashing attack, it thrust forward like a longsword, suddenly piercing straight through the massive boulder.
Had Shen Luo not reacted quickly, that strike would have run the Mirror Demon straight through the heart.
After hiding within the thick fog, Shen Luo and the other two did not rush to flee, nor did they recklessly return to that patch of dense mist. Instead, they found another concealed spot and prepared to continue lying low.
"What happened?" Still shaken, the Mirror Demon asked in confusion.
"Yuan Qiu did not make it clear earlier. When those Gu Insects die, they release a faint fluctuation of spiritual power, alerting those people." Shen Luo cautiously watched the surroundings and frowned.
"Such a tiny fluctuation should not have been noticed, right? We were practically still within the fog. We should not have been discovered." The Mirror Demon hesitated.
"They must have set up some kind of detection magical artifact outside that plaza. With the fog concealing us, as long as we hid ourselves and suppressed our spiritual power fluctuations, they would not find us. But once any spiritual power leaked out, they would notice it," Nie Caizhu guessed.
"That makes sense. If it were me, I would have set up detection measures in the fog as well." Shen Luo nodded in agreement.
"Should we continue waiting for Fellow Daoist Ao Hong and the others?" the Mirror Demon asked.
"Yes. We are in the dark while they are in the open.