As Ander led the way in trying to find the figure from before, he was easily able to find footprints. He followed the footprints through the forest. Eventually the footprints disappear, but Elaranna was easily able to point out the broken branches on the ground. The figure had gone into the trees! Just as the two come to that realization, they would see the robed figure jumping from branch to branch with ease. 

When the genasi monk sees this, she realizes that the figure they were pursuing, the person who saved them, was the same person who tried to pickpocket her earlier! She'd recognize that robe anywhere!