After in the coupling stage, the returning fluid will reverse path and now rotate within the path of the impeller and turbine, an effect which will make an effort to forward-rotate the stator. At this point, the stator clutch will launch and the impeller, turbine and stator will all (roughly) https://dallasrtrni.blogzet.com/the-definitive-guide-to-torque-converter-clutch-49031332