[Why would he be uncomfortable over a spooky cell phone app? Morgana isn't sure about that, but he does catch the glance at his hand. That, in and of itself, seems more easily understood; maybe Aiden has some sort of magic or psychic abilities himself?]

It's..... kind of complicated. But basically, sometimes in the Metaverse, people can awaken psychic powers within themselves through the strength of their will. Stuff like throwing around ice, or electricity, or healing people.