[@AcerRo]
Well, the basic idea is that the character (currently named Tina Morrison but I'm not set yet) can control how fast she perceives time. As in, she can slow down how quickly time seems to be passing for her, allowing her to react with more precision and make sure she's aware of every detail in a situation. As the name suggests, it's a change in the perceived speed of time, not the actual speed of time. It's basically making everything except her thoughts go in slow motion.