Once he left the cave, Lith flew at low altitude all the time. He had to retrieve Solus before leaving and way, even if Xedros was still watching at him via his arrays, the Wyvern wouldn't notice the pebble jumping into the Wyrmling's hand.
As soon as their mind link was restored, Solus jotted down everything Lith remembered about the overlapping arrays and their runes. Lith had focused on keeping a clear picture of them on his way back so the details were still clear in his memories.
Only when she was done her task did he share with Solus all of his memories about the meeting with Xedros.
'So the Lord of the Kellar region is a genius Warden, a Light Master, and he even has absolute control over his Origin Flames. Too bad his character is all over the place. If he wasn't so untrustworthy, he would make a perfect mentor once we're done with Faluel.'