Cale moved to where Isaiah at the request of Leyya in order to help her treat Isaiah. This would be a lot easier with a healer. Sure people should know basic first aid, but living in Prox he had gotten a bit used to having the village healer around where people could get care really easily. Out in the field though, it just wasn't that simple. You had to take care of yourself, or in this case have someone else to take care of you.

Cale helped Isaiah sit lay down as he waited for Leyya to do her thing. In the meantime he looked up to see Marta dropping icebergs on trees.
"Hey! Stop that! We're not trying to destroy the forest! Don't you have any other psynergy?" He shouted.