She ran down the stairs, taking them two at a time and then the last three with a jump. As she rounded the turn and continued down the next flight, she had a sudden premonition. She saw herself tripping on a stair, falling, lying sprawled at the foot of the staircase, right next to the door. Like a scene illuminated by the flash of an old-fashioned camera in one of those old black and white murder mysteries. She slowed down without realizing it, taking the steps one at a time decorously. There had been something unsettling in that flashing scene. She reached the bottom of the stairs safely and walked out of the building into the sunshine. Sunlight fires neurons: known scientific fact. Oh fuck! Why had she stopped hurtling down the stairs? Now she'd never be able to decide if it had been a premonition or not.
Is it still a premonition if you see it happening and then take steps to prevent it from happening? Which would stop it from happening. Which would make the premonition false. Since it didn't happen. Right?