In a dark lab, Echo’s broken device is collected by a gloved hand. A voice (possibly Red Death’s or a new big bad) whispers: “Frequencies can be rebuilt. So can speedsters. Phase two begins.”
“Sometimes the fastest way to save someone is to stop running and hear them out.” the flash season 8 episode 17
A sonic boom explodes outward. Barry phases through it, but the shockwave sends him crashing through a bus stop. Kordell flees, leaving a trail of cracked asphalt. In a dark lab, Echo’s broken device is