In a magical forest, there is a tree that doubles the height of anything that passes under its lowest branch. Keiji and Amara are on opposite sides of the tree and cannot see each other. Keiji, who is taller than Amara, walks under the branch and gets doubled in height. Then, Amara, not knowing about the tree's properties, also walks under the branch and gets doubled in height. Who can see the other person first after they both have passed under the tree's lowest branch?

Provide a brief response.
Initially, Keiji and Amara cannot see each other due to being on opposite sides of the tree. When Keiji, who is originally taller, passes under the tree's branch, his new height becomes twice his original height. When Amara passes under the branch, she too doubles in height, but since she was shorter than Keiji to begin with, even after doubling, she would potentially still be shorter than Keiji. However, it is essential to consider the tree. If it is wide and dense, it could still obscure their views regardless of their heights. Since the question does not detail the tree's thickness or transparency, let's assume it is not an impenetrable visual barrier.

Given this scenario, and assuming they can see over or through the tree to some extent, Keiji would see Amara first because he was taller to begin with, and after being doubled in height, he would remain taller. His increased height would allow him an advantage of perspective, looking over the tree more easily than Amara could see him from her vantage point. Therefore, Keiji would see Amara first, as his higher vantage point grants him a larger visible range over the tree, allowing him to spot Amara before she could see him.