Godspeed vs speedsters

Barry finds a weakness in godspeed's powers

Then Godspeed falls to the ground clutching his head "August are you all right" says Barry. Then Godspeed says "it is a side affect of being in to  at once I'm diving my speed force and if I hold on for it for long it hurts" then he runs away. Barry runs around locking up every citizen that was hit by the dark matter because they are now speedsters until Barry finds a cure for the dark matter because all his friends at star labs are dead.