The ability is a reflexive ability, which shows certain events seconds or minutes before they occur, giving the character enough time to react. It means she can dodge attacks or threats, and is almost impossible to sneak up on. The ability also improves her reflexes after a vision, enabling her to interfere and prevent what she saw. Not all events she foresees will involve her, e.g. when Tamsin manifested she saw a barfight even though she wasn't fully involved - however, she would be a witness to it.