Even though Ji Dong hadn't shared his Soul Power with Ah Jin and Lang Tianyi, he was constantly monitoring their situation. At the most critical moment, he sent this message to Ah Jin.
Although Ah Jin was puzzled and didn't understand why Ji Dong asked her to give up such a great opportunity, she ultimately did not go against Ji Dong's wishes. In her eyes, dealing with those hundreds of Dark Mages in front of her required only an area-wide Super Killing Skill to inflict massive damage -- wasn't that their real purpose after entering the Dark Five Elements Continent?
However, Ah Jin quickly grasped the profound meaning behind Ji Dong's advice and couldn't help but admire his timely warning.