For some unknown reason, Axel could see Nyx's thoughts. The reason for his brother's alienation was that he didn't want Axel to have anything to do with being a Challenger and the Tower of Erase. His goal all along was to conquer the Tower of Erase, erase it from the face of the Earth, so that normal human Axel could live a normal, happy life.
Axel's tears could not stop streaming down his face as he watched the images his brother imagined. They were filled with Axel: what he would look like when he graduated from college, when he landed a corporate job, how happy Axel would be when he introduced his girlfriend to Nyx, and what Axel would look like in a black suit as a groom when he decided to marry his girlfriend. Nyx would take care of his cute nieces and nephews.
I'm currently fixing them right now, my apologies.