Nial had a few clues why he believed the Grasp of Eclipse movement technique to be similar to the armored serpentine beast, but the reasons he had in mind were not that important.
It was more important to help the helpless serpentine beast in order to find out more about the similarity between the beast and the Grasp of Eclipse movement technique.
After all, he could travel a vast distance with the Grasp of Eclipse movement technique. If the armored serpentine beast was just a tiny bit related to the creation of the Grasp of Eclipse movement technique, it was certainly worth finding out more about it. Maybe, it helped him get a few steps closer to a solution on how to travel across the Meteorfield without potentially encountering the Origin Leviathan or some other terrific existence that could tear him apart without even trying.