"I'm - I think something's - happening --"

Steph figured they were saving another timeline's Steph. But the girl at the foot of the stairs, bleeding and broken, just looked up at her and opened her eyes, and --

Something's happening. The ghost-Steph on the stairs is flickering, like bad special effects, and the solid-Steph on the floor is staring at her and through her in dazed incomprehension.