Tasha envisions being chased by a rape gang.
Rape gangs were groups of men who would prey on lone females on planet Turkana IV for the purpose of sexual assault.
For ten years of her life (age 5 to 15), Natasha Yar evaded the rape gangs by hiding. (TNG: "The Naked Now") When the USS Enterprise-D found itself at the edge of the known universe, Yar envisioned herself back on her world. In the vision, she found a cat. Hearing the sound of the approaching rape gang, Yar said to the cat, "It's not safe here for you. Go." Soon afterwards, the lieutenant returned to the reality of the starship. (TNG: "Where No One Has Gone Before")