Echo is contained in a dampened cell at the Pipeline. But she smiles faintly.

“On my Earth, Echo was a failed audiophile. She lost her hearing in a lab accident. She doesn’t want noise. She wants the absence of error . Lossless. Perfect. Unforgiving.”

The Flash fights blind and deaf, tracking Echo through pure tactile vibration. She throws silent projectiles—he dodges by sensing the air they displace. She tries to sneak behind him—he feels the shift in room pressure.