Shifting Earth
Izroth, Luna, and Zi Yi reached the next location of where one of their party members should have been transported to if Izroth was correct. However, they had no way to tell for sure until they found their lost party member in the surrounding area. This was even more so since Izroth's sense of perception was once again limited by the black specks in the atmosphere.
He had to mostly rely on his powerful Soul Sense and capped off senses to discover any clues.
The most simple train of thought was that whoever it was would head towards the tall tower in the distance, however, both Luna and Zi Yi had experienced different difficulties after they were transported which caused them to deviate from this obvious option.
In fact, if not for Aegis already fighting against Silent Step, Izroth may have been the one to face off against him. Therefore, they no longer had the luxury of assuming that the tall tower would be the direction their party member would be headed in.