XX was laying on a rooftop, string at the empty sky when she heard the shots and went invisible. She looked over her ledge, and barely saw the glimpse if a chase. She knew immediately it was a hero chase, she recognized the fear and drive behind it. Plus, she swore she had seen that blur before...
She looked down, and tried to climb down quickly while maintaining invisibility, and stood in the middle of the backstreet, held out her invisible arms in order to help the hero when he passed, her plan to shield him from the rain of bullets.
XY fiddled in his office, nervous. He knew what was coming. He knew how the heroes would never disappear forever and that be the end of it. He knew they were coming. He knew his worst fear would come.
He would have to face his sister.
The thought of her made his blood boil, made him shiver. He was better. He tried convincing himself. He was older, stronger, smarter. That's how it always was. Small items on his desk began to float as he thought, and coming back to his senses they all dropped instantly. He mustn't sit. He must act. He must hunt. But he must be rational. He started to go into his lab, and stared at a few things, starting to form a new weapon completely of his own.