Kyran wanted to finish his business with the Armakea as soon as the outsiders observing at a distance had left. However, Dryad had sent him a telepathic message that she had not located Cyneah yet.
While Kyran confronted the Armakeans, he instructed Dryad to search for Cyneah underground. While Comodo's Earth magic could be helpful in terms of sensing presence underground, Kyran thought Dryad's Tree magic was the better choice when moving beneath the ground and securing Cyneah's safety. Unfortunately, Dryad's roots could only reach as far as 100 meters, and apparently, Cynean's location was not within a hundred radius from where they stood.
Dryad had to get closer to the crater if he wanted her to find Cyneah.
While there was a possibility she had already moved, he did not think she could have gotten far.