Barry suits up. He catches Echo exiting the vault. But as he phases toward her, she activates the cube. A wave of absolute silence expands.
“It’s not just silence. It’s a vacuum. No vibration, no heat signature, no sound waves bouncing off her. She becomes invisible to every sensor we have.” the flash s02e04 lossless
Black screen. A single audio waveform pulses, perfectly flat, no noise floor. Barry suits up