The machine in the basement is just a chair, a screen, and a thin needle of cold blue light. Mara built it from her dad's old notes after the funerals. Seven times this week she has watched her brother Eli die. Every loop ends the same way: the river behind the highway takes him before she can shout his name. Tonight the screen shows a glowing thread for each day. One thread is Saturday afternoon. She can cut it like a loose stitch. Her hand hovers over the light.

Mara pulls her hand back. She can't cut a piece of her brother's life without knowing what it does. Instead she leans in and studies the glowing threads. Saturday isn't a single line. It splits into dozens of smaller strands, all tangled together. One of them, thin and red, runs straight from the house to the river. She zooms in on it.

Mara tries to follow the red strand forward, but the machine groans. Cutting threads has a cost. The screen flashes a warning: TIMELINE UNSTABLE. The other strands start coming apart on their own. So Mara does the only safe thing left. She pulls the main power cable. The screen dies, the threads freeze in place, and Saturday is locked the way it was. Eli is still in danger out there, but at least she hasn't broken the rest of his life trying to save him.